问题如下图：怎么理解这个题的答案呢？
选项：
A. 
B. 
C. 
解释：
NO.PZ2018062003000175 问题如下 Whiof the following statements is associatewith the costs of internationtra? A.Internationtra mcause greater income inequality anthe loss of join importing country countries. B.Countries mgain from exchange anspecialization baseon relative cost aantage. C.Greater variety of procts anservices are available to househol anfirms. A is correct.Opponents of internationtra point to the potentifor greater income inequality anthe loss of joa result of import competition.Both B anC scrithe benefits of the internationtra.考点Benefits anCosts of InternationTra解析国际贸易可能会造成进口国某行业大面积工人失业，继而产生收入不公平的问题。这是国际贸易的成本之一，A正确。以较低的成本获得商品交换和专业化分工，这是国际贸易的好处而非成本，所以B错误。获取大量品种的商品和服务也是国际贸易的好处，所以C错误。 cost是国际贸易的的代价， 不是问贸易的成本（有哪些好处）
NO.PZ2018062003000175 Countries mgain from exchange anspecialization baseon relative cost aantage. Greater variety of procts anservices are available to househol anfirms. A is correct. Opponents of internationtra point to the potentifor greater income inequality anthe loss of joa result of import competition.Both B anC scrithe benefits of the internationtra. 考点Benefits anCosts of InternationTra 解析国际贸易可能会造成进口国某行业大面积工人失业，继而产生收入不公平的问题。这是国际贸易的成本之一，A正确。 以较低的成本获得商品交换和专业化分工，这是国际贸易的好处而非成本，所以B错误。 获取大量品种的商品和服务也是国际贸易的好处，所以C错误。 不理解b有什么问题，b说的就是比较优势啊
