The unit of gc is ___________________?
A. lbm/lbf. ft/sec2
B. lbf/lbm. ft/sec2
C. ft/sec2
D. lbm/lbf. sec2/ft
A. lbm/lbf. ft/sec2
B. lbf/lbm. ft/sec2
C. ft/sec2
D. lbm/lbf. sec2/ft