(please help quickly and sorry for having to post this again (´∩｀。)) hii im doing a science project on kinetic and potential energy and i was wondering if someone could help me write an example about my drawing for the project ^^

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up