[SC悬赏令] 麻烦大家解答一道prep里的关于比较的题目，谢谢啦

So-called green taxes, which exact a price for the use of polluting or nonrenewable fuels, are having a positive effect on the environment and natural resource base of countries as varied as China, the Netherlands, and Hungary.

B  as varied as are

D  that are as varied as

E  that are varied as are

正确答案为A，我选的C。我的理解是C中的 "those" 指代 "the environment and natural resource base" 。

在Manhattanprep上搜寻到的Ron的解答如下：

here's a valid way to think about it: you can substitute "including" for "as varied as"; the sentence should still work.

these two don't have exactly the same meaning - i.e., "including" isn't the SAME as "as varied as" - but, if one of them is grammatically ok, then so is the other.

我不知道该怎么理解Ron所说的，麻烦各位同学指点迷津。如果各位同学有不同的看法，也请指出。谢谢各位同学啦！