[单选题]
Suppose a skydiver jum:d w3rpv9 xs4cps fromgyf 1d5v /(w:3p)scjf admnw, a high-flying plane. What is her acceleration when she j)/ s5,dnw1fcfywg3( :madpvshe reaches terminal velocity?
A. It is essentially zero.
B. It is in the upward direction.
C. It is approximately $9.8 \; m/s^2$ downward.
D. It is a constant pointing upward.
