[单选题]
If you walk 5.0 m horizontally forward at a constant y ofd40e p.;n-q0d7j; qf ojltvelocity carrying a 10-N 077 bc8f4hzghr1isj(sr 3ax a csg3u1 ob0 ags ag frh11(3b3xcs7h784 s urcjziject, the amount of work you do is
A. more than 50 J.
B. equal to 50 J.
C. less than 50 J, but more than 0 J.
D. zero.