At the Australian War Memorial in Canberra, a Large Historic

At the Australian War Memorial in Canberra, a large historic aircraft is to be put on display. The plan is to suspend it by a steel cable from the roof. The aircraft weighs 8 tonnes, and the cable will be 5 m long, and has a radius of 1 cm. Steel has a Young's Modulus of 2x1011 N m-2. By how much will the cable stretch (in mm) when it is supporting the whole weight of the aircraft?

A) 0.08.
B) 0.8.
C) 3.2.
D) 7.7.
E) 32.0.