identifying direct current\ndirect current is produced by\nan electric motor.\nan armature.\na solenoid.\na…

Brief Explanations:

An electric motor converts electrical energy to mechanical energy. An armature is part of an electric - motor or generator. A solenoid is an electromagnet made from a coil of wire. A battery is a source of direct current as it provides a constant flow of electrons in one direction.

Answer:

D. a battery