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Idioms: "account for"

In 2007, the United States accounted _____ 21% of Internet users.

The idiom is account for, not account of. We're not saying it makes sense - it's just the way it is, as is the case with idioms. 

Correct! 

The correct answer is for. The idiom is account for, not account of. We're not saying it makes sense - it's just the way it is, as is the case with idioms.

of
for

I don't know