单选题 Consumers are concerned about the changes in package size, mainly because______.

A、 they hate to see any changes in things they are familiar with
B、 the unit price for product often rises as a result
C、 they have to pay for the cost of changing package sizes
D、 this entails an increase in the cost of packaging

【正确答案】 B

【答案解析】山第二段第一句“The manufacturer who increases the unit price of his product by changing his package size．．．”和第三段第一句“．．．a packaging expert explained that he was able to multiply the price of hard sweets by 2.5，from $1 to$2.50 by changing to a fancy jar，．．”可知生产商改变包装的主要目的就是为了提高单价，而文章一开始就提到公众对欺骗性包装非常关注，所以[B]“结果是产品单价提高”是正确答案。