When evaluating benefits realization of IT process performance, the analysis must be based on key business objectives, as they define the desired outcomes and value that the IT processes are expected to deliver and support. Key business objectives are derived from the enterprise strategy and vision, and they provide the basis for measuring and monitoring the IT process performance and benefits123. References := CGEIT Exam Content Outline, Domain 3, Subtopic B: Performance Measurement and Optimization, Task 1: Establish and monitor IT performance measurement systems to evaluate the extent to which IT delivers on its strategic objectives and desired outcomes.

According to the web search results, the CEO is accountable for providing sponsorship for the IT-enabled change across the enterprise. The CEO is the highest-ranking executive in the organization, and has the authority and responsibility to lead the strategic direction and vision of the enterprise. The CEO also has the power and influence to allocate resources, prioritize initiatives, resolve conflicts, and communicate with stakeholders. Therefore, the CEO is the best person to provide sponsorship for the ERP implementation, which is a major and complex IT-enabled change that affects the entire enterprise12.
The other options are not as accountable as the CEO for providing sponsorship for the IT-enabled change across the enterprise. The HR director is responsible for managing the human resources functions of the organization, such as recruitment, training, compensation, and performance management. The HR director may support the ERP implementation by facilitating change management, employee engagement, and organizational development, but does not have the same level of authority and accountability as the CEO3.
The IT strategy committee is a group of senior executives from different business units that provide guidance and oversight for the IT strategy and governance of the organization. The IT strategy committee may advise and approve the ERP implementation, but does not have the same level of leadership and visibility as the CEO4. The CIO is responsible for managing the IT functions of the organization, such as planning, implementing, and operating the IT systems and services. The CIO may lead and execute the ERP implementation, but does not have the same level of responsibility and influence as the CEO.
References: 1: What Is A Project Sponsor & Do You Need One When Implementing ERP?1 2: Building a Successful ERP Implementation Team | NetSuite2 3: What Does an HR Director Do? | Indeed.com 4: What Is an IT Strategy Committee? | Bizfluent : What is a CIO? Everything you need to know about the Chief Information Officer explained | ZDNet

Mapping of business objectives to IT risk is the most important factor to address in a risk self-assessment for current IT services, because it helps to align the IT risk management strategy with the business strategy and goals. Mapping of business objectives to IT risk also helps to identify and prioritize the key IT risks that could affect the achievement of the business objectives, and to determine the appropriate risk responses and controls.
Mapping of business objectives to IT risk also helps to communicate the value and benefits of IT risk management to the business stakeholders, and to foster a risk-aware culture within the organization. One of the sources that supports this answer is A Comprehensive Guide To Risk And Control Self -Assessment RCSA, which states that "RCSA aims to include the use of risk management techniques, business processes, and cultures in staff work and businesses to achieve objectives."