A 5-M-Long Steel Cable Is Horizontally Attached (Just Tautly) Between $1 \times 10 ^ { 11 }$

Multiple Choice

A 5-m-long steel cable is horizontally attached (just tautly) between two large trees. A 40-kg child hangs from the middle, and in doing so lowers the cable 6 cm from its original position. If the Young's modulus of the steel cable is $1 \times 10 ^ { 11 }$ Pa and the cross-sectional area is 0.7 cm $2$ , the distance that the steel cable is stretched is

A) 6 mm.
B) 6 m.
C) 6 cm.
D) 0.6 m.