A reaction in a cell has a delta G of zero. What does this imply about the reaction's spontaneity and equilibrium?

• A. The reaction is spontaneous and far from equilibrium.
• B. The reaction is at equilibrium with no net change in spontaneity.
• C. The reaction is non-spontaneous and far from equilibrium.
• D. The reaction is spontaneous and at equilibrium.

Answer: (B)