Skydivers jump out of planes with only the backpacks on their backs. of course, these packs contain the parachutes that keep skydivers from falling to earth too quickly.

when a skydiver opens his parachute, he suddenly stops falling so fast. what force does the parachute supply that causes this?
a) the drag force.
b) the thrust force.
c) the friction force.
d) the force of gravity.