Suppose for a Particular Production Function That $M P _ { L } = 36 \left( \frac { K } { L } \right) M P _ { X } = 36 \left( \frac { L } { K } \right)$

Suppose for a particular production function that $M P _ { L } = 36 \left( \frac { K } { L } \right) M P _ { X } = 36 \left( \frac { L } { K } \right)$ If the price of capital is $5 per unit and the price of labor is $125 per unit, at the cost-minimizing combination of capital and labor the firm should employ

A) five times as much labor as capital.
B) five times as much capital as labor.
C) 125/36 units of capital and 5/36 units of labor.
D) 36/125 units of capital and 36/5 units of labor.