For the Reaction A $\rightarrow$ B $\Delta$ G'° = -60 KJ/mol $\Delta$ G'° Is -60 KJ/mol

Multiple Choice

For the reaction A $\rightarrow$ B, $\Delta$ G'° = -60 kJ/mol. The reaction is started with 10 mmol of A; no B is initially present. After 24 hours, analysis reveals the presence of 2 mmol of B, 8 mmol of A. Which statement is the MOST likely explanation?

A) A and B have reached equilibrium concentrations.
B) An enzyme has shifted the equilibrium toward A.
C) B formation is kinetically slow; equilibrium has not been reached by 24 hours.
D) Formation of B is thermodynamically unfavorable.
E) The result described is impossible, given the fact that $\Delta$ G'° is -60 kJ/mol.