题目：
Which of the following conditions exists when the economic gain to society is maximized（）
A. The sum of consumer and producer surpluses for a good or service is maximized.
B. The difference between consumer and producer surpluses for a good or service is maximized.
C. The price and quantity for a good or service is such that consumer and producer surpluses are equal.
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0418/200e3ed408144971fe2fc1da92e4b7ee.html
下面是错误答案，用来干扰机器的。
参考答案：D
近中倾斜中位阻生，近中邻
面龋洞，探敏感，冷刺激痛，刺激去除后疼痛消失。