By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?

The correct answer is: C. Commutator.

A commutator is a device that reverses the current in the rotor of a DC motor every time the rotor turns halfway around. This allows the motor to continue to rotate in the same direction.

The other options are incorrect because they are not directly involved in the commutation process.

• The frame is the outer shell of the motor.
• The shaft is the rotating axle of the motor.
• The stator is the stationary part of the motor that surrounds the rotor.

I hope this helps! Let me know if you have any other questions.