Answer:
A. the amount of energy carried by the wave. B. the maximum displacement from the rest position.
Explanation:
The amplitude of wave is the maximum displacement by the particle from the rest position. The displacement in positive axis is called the crest of wave while the displacement in negative axis is called the trough of a wave. It is also known as the amount of energy carried by the wave.
Hence, the correct options is D "both A and B".
