When the competitive market is using its resources efficiently, the (当竞争市场有效利用资源时,——中文由在线翻译而来,仅供参考)
选项：

A:total amount of consumer surplus is maximized.消费者剩余总额最大化。
B:total amount of producer surplus is maximized.生产者剩余总额最大化。
C:sum of the total amount of consumer surplus plus the total amount of producer surplus is maximized.消费者剩余总额加上生产者剩余总额的总和最大化。
D:sum of the total amount of consumer surplus plus the total amount of producer surplus equals zero.消费者剩余总额加上生产者剩余总额的总和等于零。