The Marginal Benefit from Investment for a Firm Is Equal $\frac { M P ^ { \prime } { } _ { K } { } ^ { + 1 - d } } { ( 1 + r ) }$

Multiple Choice

The marginal benefit from investment for a firm is equal to

A) $\frac { M P ^ { \prime } { } _ { K } { } ^ { + 1 - d } } { ( 1 + r ) }$ .
B) $\frac { M P ^ { \prime } { } _ { K } { } ^ { + 1 + d } } { ( 1 + r ) }$ .
C) $\frac { M P ^ { \prime } { } _ { K } ^{( 1 - d ) }} { ( 1 + r ) }$ .
D) $\frac { M P ^ { \prime } { } _ { K } ^{- 1 + d }} { ( 1 + r ) }$ .
E) $\frac { M P ^ { \prime } { } _ { K } ^{- 1 - d } }{ ( 1 + r ) }$ .