1. A parachute is used for safety reasons in planes, helicopters, etc basically vehicles that fly.
2. Parachutes can be used as a pleasure or a way of having fun. For example: sky diving,parasailing,etc
3. military uses. The military use parachutes to drop equipment to the troops with out the use of a landing strip because of the lack of them.
4. a parachute was equipped on Apollo. when the Ares rocket booster was dropped, a parachute was deployed so that it would safely drop into an ocean.
If that answer was not correct or sufficient for you, I would be happy to assist you in find more or the correct answer. Just let me know. :0
Its d because must wouldn't make sense, could wouldn't make sense, and would wouldn't make sense either so therfore its d
