**Frequency Response of Vibration Galvanometer**

The frequency response shown in the figure corresponds to a vibration galvanometer. A vibration galvanometer is a type of measuring instrument used to detect and measure small electrical currents. It operates based on the principle of mechanical vibration.

**Working Principle of Vibration Galvanometer**

A vibration galvanometer consists of a coil suspended between the poles of a permanent magnet. When a current flows through the coil, it experiences a force due to the interaction between the magnetic field of the coil and the magnetic field of the permanent magnet. This force causes the coil to vibrate.

**Frequency Response**

The frequency response of a measuring instrument refers to its ability to accurately measure signals of different frequencies. In the case of a vibration galvanometer, its frequency response is typically limited, meaning it may not accurately measure signals of all frequencies.

**Characteristics of Frequency Response**

The frequency response of a vibration galvanometer is characterized by the following aspects:

1. Low-pass Filter: The frequency response of a vibration galvanometer typically exhibits a low-pass filter characteristic. This means that it can accurately measure signals with frequencies below a certain cutoff frequency. Signals with frequencies above the cutoff frequency may not be accurately measured or may be attenuated.

2. Cutoff Frequency: The cutoff frequency of a vibration galvanometer refers to the frequency at which the response starts to roll-off or decrease. This is the frequency beyond which the galvanometer's accuracy decreases or it becomes less sensitive to the input signal.

3. Bandwidth: The bandwidth of a vibration galvanometer is the range of frequencies over which it can accurately measure signals. It is determined by the difference between the upper and lower cutoff frequencies.

4. Amplitude Response: The amplitude response of a vibration galvanometer refers to the variation in its sensitivity with respect to different frequencies. It indicates how the galvanometer's sensitivity changes as the frequency of the input signal varies.

**Conclusion**

Based on the characteristics mentioned above, the frequency response shown in the figure most likely corresponds to a vibration galvanometer. The presence of a rolloff or decrease in sensitivity beyond a certain frequency indicates that the galvanometer has a limited frequency response. This is consistent with the behavior of a vibration galvanometer, making option 'C' the correct answer.