Standing waves can be thought of as a sin wave and a cos wave overlapping each other. They go in different direction hence Cis correct
Wave interference can be thought of as the opposite of destructive ---> constructive anda hencd meet and interact on the same medium such that answerBis correct
The best position for the person would be outside, under a clear sky, standing up. He should do it sometime between sunset and sunrise, from a day before until a day after the moment of Full Moon.
