Which statement best describes the superposition principle?

AIf two in-phase waves arrive simultaneously at a point, their amplitudes add up.

BIf two out-of-phase waves arrive simultaneously at a point, their amplitudes add up.

CIf two in-phase waves arrive at a point one after another, their amplitudes add up.

DIf two out-of-phase waves arrive at a point one after the other, their amplitudes adds up