O operate this generator, a human applies a force by turning the crank. This action generates an electric current, which lights the light bulb. The crank in this apparatus is connected to a shaft that
A.
spins conductive coils of wire through the magnetic field produced by the magnets.

B.
spins small magnets inside of the magnetic field produced by the larger magnets.

C.
generates a magnetic field in the magnets.

D.
grinds iron coils against copper wires to generate sparks.