The following activities are part of Risk Management:
Initial risk assessment
Risk mitigation and residual risk assessment
Risk monitoring
Risk Management is the process of identifying, assessing, and responding to risks that may affect the achievement of the enterprise's objectives. Risk Management involves balancing positive and negative outcomes resulting from the realization of either opportunities or threats. Reference: The TOGAF Standard | The Open Group Website, Section 3.3.3 Risk Management.

Statements 1 and 3 highlight the value and necessity for Architecture Governance to be adopted within organizations. Architecture Governance is the practice and orientation by which Enterprise Architectures and other architectures are managed and controlled at an enterprise-wide level12. It ensures that architectural decisions are aligned with the organization's strategy, objectives, and standards. Architecture Governance also involves establishing and maintaining processes, decision-making, and mechanisms to avoid or minimize potential conflicts of interest, such as between different stakeholders, business units, or projects34. Moreover, Architecture Governance requires transparency and accountability for all actions implemented and their decision support, so that they can be inspected and evaluated by authorized parties, such as auditors, regulators, or customers5 . References:
*The TOGAF Standard, Version 9.2 - Architecture Governance - The Open Group
*Architecture Governance - The Open Group
*Tutorial: Governance in TOGAF's Architecture Development Method (ADM)
*Architecture Governance in TOGAF: Ensuring Effective Management and Compliance
*The TOGAF Standard, Version 9.2 - Definitions - The Open Group
*[Architecture Governance in TOGAF: Ensuring Alignment and Control]

A set of architecture principles that cover every situation perceived meets the recommended criteria of completeness. Completeness is one of the six criteria that should be applied when developing or assessing architecture principles. Completeness means that there are no gaps or overlaps in the coverage of principles across all relevant aspects of the enterprise's architecture. Reference: The TOGAF Standard | The Open Group Website, Section 3.3.7 Architecture Principles.

Architecture governance is the practice of ensuring compliance with the enterprise architecture and its principles, standards, and goals. Architecture governance provides the means to establish, monitor, and control the architecture development and implementation processes, and to resolve any issues or conflicts that may arise. Architecture governance also ensures that all stakeholders are represented and involved in the decision-making process, and that their interests and concerns are balanced and aligned. Statements 1 and 2 highlight the value and necessity for architecture governance to be adopted within organizations, as they emphasize the importance of responsibility, accountability, fairness, and transparency in the architectural activities. Statements 3 and 4 are more related to the benefits and outcomes of having a good enterprise architecture, rather than the governance aspect.
Reference: : The TOGAF Standard, Version 9.2, Part VI: Architecture Capability Framework, Chapter 50: Architecture Governance : The TOGAF Standard, Version 9.2, Part III: ADM Guidelines and Techniques, Chapter 29: Architecture Governance

According to the TOGAF Standard, 10th Edition, a stakeholder is "an individual with an interest in a system"
1. A stakeholder can be anyone who is affected by the system, or who can influence or be influenced by the system. Stakeholders can have different roles, perspectives, and concerns regarding the system, and they can be internal or external to the organization. Stakeholder management is a technique that helps to identify, analyze, and engage the stakeholders of an architecture project, and to address their needs and expectations 2.
The other options are not correct, as they are not the term used by the TOGAF Standard to describe an individual with an interest in a system. A consumer is "an individual or group that uses a product or service"
1. A lead architect is "an individual who is responsible for leading the development of an architecture" 1. A sponsor is "an individual who provides funding and support for an architecture project" 1. References: 1:
TOGAF Standard, 10th Edition, Part I: Introduction, Chapter 3: Definitions. 2: TOGAF Standard, 10th Edition, Part III: ADM Guidelines and Techniques, Chapter 24: Stakeholder Management.