Which of the Following Statements Best Describes What It Means

Multiple Choice

Which of the following statements best describes what it means for the acid-base reaction between acetic acid and water to be in equilibrium?

A) The mass of acetic acid and acetate is equal.
B) The number of moles of acetate equals the number of moles of acetic acid.
C) The number of moles of hydronium equals the number of moles of water.
D) The forward and reverse reactions proceed at the same rate.
E) The reaction is balanced.