[单选题]
Suppose a ball is thrown straight up. Whawe( xq(kni-elz25 mn5gg8t +6k5bmqat is its acceleration just b;,cqhyc 1:mxcd-w+ te 1do2 crefore it reaches its highew: +x -eqt,1c 2r cmohccy1;ddst point?
A. zero
B. slightly less than g
C. exactly g
D. slightly greater than g
