What might a high loop gain indicate in a feedback control system?

A high loop gain in a feedback control system typically indicates a greater sensitivity to disturbances. This is because high loop gain amplifies the difference between the setpoint and the actual process variable. When a disturbance occurs, the system will respond more aggressively to correct the error, which can lead to a more significant correction than what might be necessary.

While higher loop gain can indeed contribute to a faster response time, it can also introduce risks of instability if the system is not designed to handle such sensitivity. Therefore, while the response time may improve, a balance must be maintained to ensure the system remains stable and does not overshoot or oscillate excessively.

Thus, in the context of control systems, greater sensitivity to disturbances is a prominent characteristic of high loop gain, making option C the most appropriate choice. This sensitivity can have significant implications for the design and operation of control systems, particularly in environments where disturbances are common.