第4题: [单项选择]The______ choice for a consumer, therefore, is the choice among the available ones that will enable him or her to maximize utility. A. optimal B. optional C. optical D. optimistic 参考答案:A 答案解析:[解析] the optimal choice意为“最佳选择”。optinal意为“可选择的";optical意为“光学的";optimistic意为“乐观的”。