[单选题]
A 50-N object was lifted 2.0 m vertically a8 z h0ubhz8z,qnd is +g6 gn9fuvrgd(zd. gb k3m;: xbeing held there. How much work is being doner: ;bn+ ug.vz96gfk(gd dm3 xg in holding the box in this position?
A. more than 100 J
B. 100 J
C. less than 100 J, but more than 0 J
D. 0 J
