[单选题]
The windings of a DC motor have a resio+zfwr/ b9eh 3kx71l cstance of 6.00 W. The motor operates ui;.((h*gws9xjx meion 120 V AC, and when running at full speed it ge(u.9 xii;ws(mej*gxh nerates a back $emf$ of 105 V. What current does the motor draw when operating at full speed?
A. $2.50 \; A$
B. $17.5 \; A$
C. $20.0 \; A$
D. $37.5 \; A$