A Vertical 30-Cm Steel Rod, 1 $2.0 \times 10 ^ { 11 } \mathrm {~N} / \mathrm { m } ^ { 2 }$

A vertical 30-cm steel rod, 1.0 cm in diameter, supports a 300-kg mass. What is the change in Iength of the rod caused by this mass? Young's modulus for steel is $2.0 \times 10 ^ { 11 } \mathrm {~N} / \mathrm { m } ^ { 2 }$

A) $6.5 \times 10 ^ { - 5 } \mathrm {~m}$
B) $6.5 \times 10 ^ { - 6 } \mathrm {~m}$
C) $6.5 \times 10 ^ { - 4 } \mathrm {~m}$
D) $5.6 \times 10 ^ { - 6 } \mathrm {~m}$
E) $5.6 \times 10 ^ { - 5 } \mathrm {~m}$