Final answer:
The correct answer is C Approved change requests. All of the other options can be inputs to Monitor and Control Project Work.
Step-by-step explanation:
The correct answer is C Approved change requests. All of the other options - A Requirements management plan, B Quality management plan, and D Schedule management plan - can be inputs to Monitor and Control Project Work.
A Requirements management plan outlines how project requirements will be identified, documented, and managed throughout the project. B Quality management plan describes how quality will be planned, executed, and controlled within the project. D Schedule management plan provides guidance on how the project schedule will be developed and managed.
In contrast, approved change requests are outputs of the Perform Integrated Change Control process, not inputs to Monitor and Control Project Work.