Final answer:
The amplitude of one wave is indeed affected by the amplitude of another wave when they are precisely aligned, a condition known as constructive interference, thus making the statement true. The correct option is A.
Step-by-step explanation:
The statement 'The amplitude of one wave is affected by the amplitude of another wave only when they are precisely aligned' refers to a phenomenon in physics known as constructive interference. This occurs when two waves meet while being in phase, or when the crests and troughs of the waves align, and consequently, their amplitudes add together.
This results in a new wave with a greater amplitude than either of the individual waves. Therefore, the statement is true. However, if two waves meet and are not in phase, they may partially or completely cancel each other out, depending on the degree of misalignment, which is known as destructive interference.