108. Two wires A and B are of same materials. Their lengths are in the ratio 1 : 2 and diameters are in the ratio 2 : 1 w

Two wires A and B are of same materials. Their lengths are in the ratio 1 : 2 and diameters are in the ratio 2 : 1 when stretched by force F_A  and  F_B  respectively they get equal increase in their lengths. Then the ratio F_A /F_B  should be

(a)  1 : 2                                    (b)  1 : 1

(c)   2 : 1                                    (d)  8 : 1

Answer-d