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

Multiple Choice

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

A) $M R S_{C, C^{\prime}}=\frac{1}{(1+r) }$
B) $M R S_{C, C^{\prime}}=(1+r)$
C) $M R T_{C, C^{\prime}}=\frac{1}{(1+r) }$
D) MRT_c,c' = (1 + r) .
E) MRS_c,c' = we(1 + r) .