How Would the Self-Inductance, L, of a Coil Change If

Multiple Choice

How would the self-inductance, L, of a coil change if you would increase its radius by a factor of two and increase its length by a factor of two?

A) L would not change.
B) L would be doubled.
C) L would be quadrupled.
D) L would be halved.
E) L would be reduced by 4.