For the Consumer to Be at an Optimum, It Must $M R T _ { C , c ^ { \prime } } = ( 1 + r )$

Multiple Choice

For the consumer to be at an optimum, it must be the case that

A) $M R T _ { C , c ^ { \prime } } = ( 1 + r )$ .
B) $M R S _ { C , c ^ { \prime } } = \frac { 1 } { ( 1 + r ) }$ .
C) $M R S _ { C , c ^ { \prime } } = w e ( 1 + r )$ .
D) $M R S _ { C , c ^ { \prime } } = ( 1 + r )$ .
E) $M R T _ { \mathcal { C } , c ^ { \prime } } = \frac { 1 } { ( 1 + r ) }$ .