[单选题]
Suppose a ball is thrown straight ufdtsd.n+o7 tgj,2 , sop. Whdn-d1v- va,jpbgqg +rkxm 4q0)r z/3j at is its acceleration just before it reaches its highest poijpd1g4vnqg3b rz0 ak j xq)-r+ /m-,dvnt?
A. zero
B. slightly less than g
C. exactly g
D. slightly greater than g
