OG193 those的指代问题！

193. Unlike the United States, where farmers can usually depend on rain or snow all year long. the rains in most parts of Sri Lanka are concentrated in the monsoon months, June to September, and the skies are generally clear for the rest of the year.

(A)  Unlike the United States, where farmers can usually depend on rain or snow all year long, the rains in most parts of Sri Lanka

(B)  Unlike the United States farmers who can usually depend on rain or snow all year long, the rains in most parts of Sri Lanka

(C)  Unlike those of the United States, where farmers can usually depend on rain or snow all year long, most parts of Sri Lanka's rains

(D)  In comparison with the United States, whose farmers can usually depend on rain or snow all year long, the rains in most parts of Sri Lanka

(E)   In the United States, farmers can usually depend on rain or snow all year long, but in most parts of Sri Lanka the rains

In comparative structures (unlike X, Y...; in comparison with X,Y...) X and Y must be both logically and grammatically parallel. Choices A, B, C, and D all fail to observe logical parallelism: (A) Unlike the United States,... the rains...; (B) Unlike the United States farmers .. . , the rains .. . ; (C) Unlike those of the United States, . . . most parts of Sri Lanka's rains ... ; and (D) In comparison with the United States,... the rains... . C also suffers from the unintelli­gible most parts of Sri Lanka's rains. E, the best choice, avoids the problem by using two independent clauses linked by but to present a clear, direct contrast between conditions in the United States and those in most parts of Sri Lanka.

这题好像CD上只有一次讨论，没有结果，所以我再想问问大家。

1。C中的those到底是指代什么？parts还是rains？个人认为是指代parts，虽然parts其实即使rains，但是从语法上看还是指代的parts。OG上说得不平行，为什么呢？

2。黄色部分，是说法不好吗？是有歧异吗？我认为它可以表达两个意思：

可以是说S地区雨的大部分（直译），也可以说是大部分S地区的雨

请NN指教！！