ANSWER:
A: Wavelength
B: Amplitude
Explanation:
We have the following:
The amplitude of an oscillatory, undulating movement is a measure of the maximum variation of the displacement or other physical quantity that varies periodically or quasi-periodically in time. It is the distance between the furthest point of a wave and the equilibrium or middle point.
The wavelength is its spatial period, that is, the distance at which the waveform repeats itself. Normally, two consecutive points that have the same phase are considered: two maxima (crests) or two minima (troughs).
Therefore, we can say that A is a wavelength while B is the amplitude.