This is because when the requirements are complex and cannot be implemented by the project deadline, the BA should prioritize the requirements based on their value, urgency, and dependency, and communicate the priority to the project team and the stakeholders. This way, the BA can ensure that the most beneficial requirements are delivered first, and the expectations of the stakeholders are managed. Ensuring users are trained based on requirements (A) is not relevant to the question, as it is a post-implementation activity.
Applying quality control on requirements (B) is a good practice, but it does not address the issue of complexity and deadline. Utilizing requirements documentation template © is not a valid option, as it does not affect the prioritization or implementation of the requirements. References: CCBA Practice Test, CCBA Mock Test