Determine the Integral by Making an Appropriate Substitution $\int \frac { e ^ { 1 / x } } { x ^ { 2 } }$

Multiple Choice

Determine the integral by making an appropriate substitution.
- $\int \frac { e ^ { 1 / x } } { x ^ { 2 } }$ dx

A) $e ^ { 1 / x }$ + C
B) - $e ^ { 1 / x }$ + C
C) -x $e ^ { 1 / x }$ + C
D) x $e ^ { 1 / x }$ + C
E) none of these