The Resistance of the Armature Windings of DC Motor Is $\Omega$

Multiple Choice

The resistance of the armature windings of DC motor is 5 $\Omega$ .The motor is connected to a 120 V line.When the motor is spinning at full speed,it draws a current of 4 A.The bACk EMF at full speed is

A) 20 V
B) 100 V
C) 120 V
D) 40 V
E) 80 V