[单选题]
97.01: A force F directed at an anx9x7( vo;naa ;d,5zad+saec d gle of -/i+rpze o;n g8kgj6 nθ above the horizontal is used to pull a crate a distance D across a level -gr6kn/pe 8oin g+;jzfloor. The work done by the force F is
A. $FD$
B. $FD cosθ $
C. $FD sinθ $
D. $ mg sinθ $
E. $mgDcosθ$
