[单选题]
A sky diver falls throusloj6i.voz)n u 6 5sc8gh the air at terminaqg y dc ek8k;+rk,dn*x6g -m8t wi-b+wl velocity. The force of air resistance on +d -e+mwbgk* -k ;d tq6ck8nry8w,xig him is
A. half his weight.
B. equal to his weight.
C. twice his weight.
D. cannot be determined from the information given
