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The correct answer is:
d.If NaOH is added, the OH- ions react with the CH3COO- ions.
The solution is a buffer solution. The addition of a small amount of a strong acid or base will not change the pH very much. The H+ ions from the acid will react with the CH3COO- ions to form CH3COOH, and the OH- ions from the base will react with the CH3COOH to form CH3COO-. This will keep the concentrations of H+ and CH3COO- ions relatively constant, and the pH will not change very much.