You take a conductive wire and make loops in it, you create a
a.) circuit breaker
b.) rheostat
c.) solenoid
d.) fuse

When you take a long piece of wire, form it into a coil of several loops, and run a current through it, you get a magnetic field that runs straight along the axis of the coil.

This arrangement of a conductor and the current through it is called a "solenoid". (C)