单选题 "The artificial standard" (Paragraph 4) refers to the difference between standards of judgment for ______.

【正确答案】 C
【答案解析】本文倒数第三句:set up an artificial double standard,one for American art,and another for European art,文中提到的an artificial double standard指的是欧洲艺术和美国艺术的评价标准之间的差异。