A Force of 15 $\times$ 10^-4 $\times$ 10^-4 $\times$ 10^-4 $\times$ 10^-4 $\times$ 10^-4

Multiple Choice

A force of 15.0 N is applied to a wire with an un-stretched length of 4.00 m and a diameter of 5.00 mm.If the wire changed length by 1.20 mm,then the strain in the wire is

A) 1.00 $\times$ 10^-4.
B) 2.00 $\times$ 10^-4.
C) 3.00 $\times$ 10^-4.
D) 4.00 $\times$ 10^-4.
E) 5.00 $\times$ 10^-4.