The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?

Question

( A ) length = 300 cm, diameter = 3 mm
( B ) length = 100 cm, diameter = 1 mm
( C ) length = 50 cm, diameter = 0.5 mm
( D ) length = 200 cm, diameter = 2 mm