[单选题]
A sky diver falls through the ainwd1wlgpq,y mu2 e+oia70s)50h . yoxr at termin.4amu6 zw- aqg9 ek4lg89gest al velocity. The force of air resistan eu9w.lg8qtg-sagzem 4a 94k6ce on him is
A. half his weight.
B. equal to his weight.
C. twice his weight.
D. cannot be determined from the information given
