So - called green taxes, which exact a price for the use of polluting or non renewable fuels, are having a positive effect on the environment and natural resource base of countries as varied as China, the Netherlands and Hungary
1) as varied as
2) as varied as are
3) as varied as those of
4) that are as varied as
5) that are varied as are

This question is from Powerscore.
OA is A. Can some oe explain please

This is what I think:

The sentence needs to compare environment and natural resourse base of countries as "those of" China, Netherlands and Hungary.

Also we need to have comparison X as those of Y

Ans "C" seems to be right answer