moving a magnet inside, a coil of wire will induce a voltage in the coil. How is the voltage in the coil increased?

a By holding the magnet, absolutely still
b By moving the coil of wire slowly and keeping the magnet stationary
c Moving the magnet inside the coil of wire more rapidly
d By moving the magnet inside, the coil of wire more slow

c Moving the magnet inside the coil of wire more rapidly