Solve the Equation by Making an Appropriate Substitution $x ^ { 2 / 5 } - x ^ { 1 / 5 } - 20 = 0$

Multiple Choice

Solve the equation by making an appropriate substitution.
- $x ^ { 2 / 5 } - x ^ { 1 / 5 } - 20 = 0$

A) $\{ 3125 , - 1024 \}$
B) $\{ - 3125,1024 \}$
C) $\{ 5 , - 4 \}$
D) $\{ - 5,4 \}$