How does the resistance of a copper wire change when both the length and diameter of the wire are double?

How does the resistance of a copper wire change when both the length and diameter of the wire are doubled?

(a)
It decreases by a factor of two.
(b)
It increases by a factor of two.
(c)
It increases by a factor of four.
(d)
It decreases by a factor of four.
(e)
It does not change.
2 answers