In case of a damped oscillation. (a) amplitude increases (b) remains constant (c) none (d) amplitude reduces

option (d)

Explanation:

There are two types of oscillations.

1. Damped oscillations: The oscillations in which the amplitude of a wave goes on decreasing continuously are called damped oscillations.

For example, the oscillations of a seismic wave.

2. Undamped oscillations: The oscillations in which the amplitude o a wave remains constant are called undamped oscillations.

for example, oscillations of light waves.

i think the answer is a, hope this is right, that would be my best guess.