Explanation
This question is about managing a project with frequent scope changes and new knowledge, which suggests that the project is following an adaptive or agile approach. In such a situation, the project manager should use agile practices and tools to ensure that the project outcomes are aligned with the business goals and the stakeholder expectations. One of these practices is to create a prioritized backlog, which is a list of features or requirements that are ranked according to their value and urgency. The backlog helps the team to focus on the most important and relevant work items and to deliver them in short iterations. Another practice is to define iteration review sessions with stakeholders, which are meetings that occur at the end of each iteration to demonstrate the completed deliverables, collect feedback, and validate the value and quality of the work. The iteration review sessions help the team to communicate with the stakeholders, incorporate their input, and ensure their satisfaction. These practices can prevent the situation from happening in the future, as they can enhance the transparency, collaboration, and alignment of the project. The other options are not as suitable for managing a project with frequent scope changes and new knowledge, as they are more aligned with a traditional or predictive approach. Creating a detailed WBS and milestone schedule may not be realistic or feasible, as the scope may change or be unclear at the beginning of the project. Scheduling a kick-off meeting for every project phase may not be necessary or effective, as the project may not have distinct phases or the project management plan may change frequently. Scheduling a daily meeting to review team performance and impediments may not be sufficient or relevant, as it does not involve the stakeholders or address the business goals. References:
PMI, A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Sixth Edition, Project Management Institute Inc., 2017, pp. 28-29, 35-36, 54-55, 170-171, 176-177, 487.
Ultimate Guide To Hybrid Project Methodologies & How To Make Them, The Digital Project Manager,
2023, pp. 4-5, 9-10.
A Guide to Hybrid Project Management: Blending Agile and Traditional PM, Float, 2023, pp. 3-4, 7-8.

Because Mitigation is - Taking steps to lessen risk by lowering the probability of a risk event's occurrence or reducing its effect should it occur. (Actual answer is Transference. This is not given in the given choices. Please refer PMBOK Chapter 11, Page: 142.)

According to the PMBOK Guide, 6th edition, section 13.2.2.4, stakeholder engagement assessment matrix is a tool that can be used to identify the current and desired levels of engagement for each stakeholder or stakeholder group. The project manager should use this matrix to plan and implement appropriate strategies to increase the support and minimize the resistance of the stakeholders. One of the strategies is to meet with the stakeholder and discuss the impact of the project deliverable on their interests, needs, and expectations. The project manager should also explain the benefits of the deliverable for the organization and the stakeholder, and address any concerns or issues that the stakeholder may have. By doing so, the project manager can increase the stakeholder's awareness, understanding, and involvement in the project, and foster a positive relationship with them. References: PMBOK Guide, 6th edition, section 13.2.2.4; PMI website