[单选题]
Suppose a skydiver jumps froef t6g 9 msla cr /:fg3zz,qli( *xrz:c/+b)vgm a high-fz 5l i2 u0yscf8z*pim5lying plane. What is her acceleration when she she reaches terminal velocitpf2u s5lm z5cyz8i0*iy?
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.