[单选题]
The windings of a DC motor have a resistance of 6.00 W. The m tz x hkg9;rjcto6+(cu o46/ibotor operates na+ e 0(/cqj*ncx0ge(s b w)uxon $120 \; V$ AC, and when running at full speed it generates a back $emf$ of 105 V. What is the starting current of the motor?
A. $2.50 \; A$
B. $17.5 \; A$
C. $20.0 \; A$
D. $37.5 \; A$
