Final answer:
Elevated noise levels indicate a search is happening in a particular room.
Step-by-step explanation:
Elevated noise levels indicate that a search is presently underway in a particular room. When there is a search happening, people might be talking loudly, moving items around, or using equipment that creates noise.
For example, in a police search, officers might be talking to each other, searching through drawers, and moving furniture, all of which can contribute to elevated noise levels.
Therefore, the correct answer is c) Elevated noise levels as it suggests that something is happening in the room.