The Enzyme Phosphoglycerate Mutase Operates At $\Delta$ G ≈ 0 KJ/mol

Multiple Choice

The enzyme phosphoglycerate mutase operates at $\Delta$ G ≈ 0 kJ/mol. That indicates that the reversibility of that reaction

A) is spontaneous.
B) occurs rapidly.
C) occurs at equilibrium.
D) is nonspontaneous.