The Marginal Cost of Investment for the Firm Is Equal $- M P ^ { \prime } K$

Multiple Choice

The marginal cost of investment for the firm is equal to

A) $- M P ^ { \prime } K$ .
B) $1 / M P ^ { \prime } K$ .
C) 1 .
D) $M P ^ { \prime } K$ .
E) $- 1$ .