[单选题]
Suppose a ball is thrown szq8rj 6u dri9ir: ij7nh ,:wuc--mba( traight up. What is its acceleration just beforup9,mwu3o4d(1sm + gmfnj j ;ae it reaches its high mpsmuaj(w , um4n jd;9+1gof3est point?
A. zero
B. slightly less than g
C. exactly g
D. slightly greater than g
