For the Reaction A $\rightarrow$ B, the K_eq' Is 10⁴ $\Delta$ G'° for the Reaction Will Be Large and Positive

For the reaction A $\rightarrow$ B, the K_eq' is 10⁴. If a reaction mixture originally contains 1 mmol of A and no B, which statement must be TRUE?

A) At equilibrium, there will be far more B than A.
B) The rate of the reaction is very slow.
C) The reaction requires coupling to an exergonic reaction in order to proceed.
D) The reaction will proceed toward B at a very high rate.
E) $\Delta$ G'° for the reaction will be large and positive.