The Values of M for Which $y = x ^ { m }$

Multiple Choice

The values of m for which $y = x ^ { m }$ is a solution of $x ^ { 2 } y ^ { \prime \prime } - 5 x y ^ { \prime } + 8 y = 0$ are

A) 2 and 4
B) $- 2$ and $- 4$
C) 3 and 5
D) 2 and 3
E) 1 and 5