Answer:
D. the armature and commutator
Explanation:
An electric generator is based on the principle that when a conducting coil rotates in the magnetic field, an electric current is generated. It converts mechanical energy to electrical energy.
Armature is the rotating part of the generator. Armature is connected to commutator which is a cylindrical in shape and rotates with it. It also connects the armature to the external circuit by brushes.
