[单选题]
A sky diver falls throvj.gb(btw5 n+mi3 5xwugh the air at ad8f5:r (v.rsuo;ktpterminal velocity. The force of air resistance on him is(kovd ars:f8 ;. tr5up
A. half his weight.
B. equal to his weight.
C. twice his weight.
D. cannot be determined from the information given
