The Differential Equation $y ^ { \prime } - y / x = y ^ { 2 }$

Multiple Choice

The differential equation $y ^ { \prime } - y / x = y ^ { 2 }$ can be solved using the substitution

A) $u = y$
B) $u = y ^ { 2 }$
C) $u = y ^ { 3 }$
D) $u = y ^ { - 1 }$
E) $u = y ^ { - 2 }$