[单选题]
A cyclist does work at 43qrdpvms h03s nzx8)r d8uh wv41, abthebear:4gu-c3ob r :b*p rate of 500 W while riding. How much force does her foot push with when :ec rbprb3 a4* bugo:-she is traveling at 8.0 m/s?
A. $31 \; N$
B. $63 \; N$
C. $80 \; N$
D. $4000 \; N$
