In the case of the utility function U$($c$,$c$\text{'})=$ a ln c $+$ b lnc$\text{'},$ the marginal rate of substitution of current consumption for future consumption, MRS$($c$,$c$\text{'})$ is equal to

Question $13$ options:

a ln c $/($b lnc$\text{'})$

a c$\text{'}/($b c$)$

a c $/($b c$\text{'})$

b c$\text{'}/($a c$)$

$($a b$)/($c c$\text{'})$