A falling skydiver opens his parachute. A short time later, the weight of the skydiver-parachute system and the drag force exerted on the system are equal in magnitude. Which of the following statements predicts the motion of the skydiver at this time?
A. The skydiver is at rest.
B. The skydiver is moving downward with constant speed.
C. The skydiver is moving downward with an upward acceleration.
D. The skydiver is moving downward with a downward acceleration.