The height of a sinusoidal wave is called its
a. phase.
b. amplitude.
c. period.
d. frequency.

The height of a sinusoidal wave is called its amplitude.

Explanation:

The height of a sinusoidal wave is called its amplitude. It is also defined as the maximum displacement of the particles of the waves. It the distance between the rest position to the crest or the rest position to the trough of the wave. The amplitude of a wave measures its intensity.

The intensity of a wave is directly proportional to the square of its amplitude.

So, the height of a sinusoidal wave is called wave's amplitude. So, the correct option is (b) "amplitude".

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