The consumer's preferences over current and future consumption are described by the following utility function: U$($c$,$c$\text{'})=$ln$($c$+$bc$\text{'}),$ where b$>0$ is a constant. The marginal utility of future consumption, Uc$\text{'}($c$,$c$\text{'})$ is given by

Question $10$ options:

$1/$ ln$($c$+$bc$\text{'})$

b ln$($c$+$bc$\text{'})$

c$+$b c$\text{'}$

b $/($c$+$bc$\text{'})$

b $($c$+$bc$\text{'})$