Explanation
According to the PMBOK Guide 7th Edition, the project manager should select the project approach that best suits the project context and stakeholder needs. The project manager should also consider the impact of the chosen approach on the project delivery and the organization. Therefore, the project manager should review the adaptive tools' impact and obtain agreement from the functional manager before implementing them in the project. This would help to address the functional manager's concerns and ensure alignment with the PMO's request. Option A is incorrect because it ignores the functional manager's concerns and may cause resistance or conflict. Option C is incorrect because it disregards the PMO's request and may miss the opportunity to use adaptive tools that could benefit the project. Option D is incorrect because it assumes that the project manager can make the decision on the project approach without consulting the functional manager or the PMO, which could lead to misalignment or misunderstanding. References: PMBOK Guide 7th Edition, Chapter 2: Creating a High-Performing Team, Section 2.3: Selecting the Project Approach, p. 37-38.