Amplitude is: A.) the distance between the top or bottom of a wave and the center of the wave
B.) the distance between two identical points on a wave
C.) the number of waves in a certain amount of time
D.) the noise floor acceptable in recording

Amplitude, in physics, the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position. It is equal to one-half the length of the vibration path.

So A! :)

if I'm wrong sorry, but hope this helps! :D Have a nice day^^

Explanation:

it was vincent van gogh