[单选题]
A motor that can do work at the rate of awstt7jmfzb1i ./o6 0ct ud(7t ni c:/2.0 hp has 60% efficiency. How muchbs+r e ,tsw:u2k(.gtfl,rlwo/ t;i+t current does it d+ ie2 .rftgbuls,tt :r,wto/w;k(s l+raw from a 120-V line? ($1 \; hp = 746 \; W$)
A. $12 \; A$
B. $17 \; A$
C. $21 \; A$
D. $29 \; A$
