C:In Japan would have to be balanced by in the United States,but the preposition in cannot follow the preposition unlike; this construction is awkward and imprecise
黄底纹那句解释,看了还是8太明白哎...
我的理解是如果说in J 与unlike the U S是平行的,应该写成in j,unlike in the United States,但是两个介词unlike 与in不能放在一起,所以说c是错的