Sentence Correction

Thanks

The reason (or, one of the reasons) that C is correct rather than B is because the modifying phrase that begins with "which" clearly refers to its logical antecedent, the Anti-Cybersquatting Consumer Protection Act, in answer C.

In answer B, the "which" phrase immediately follows the word (or number, I guess) "1999", making it sound as if 1999 is the thing that allows consumers to seek damages (and this, of course, wouldn't make sense).

Hope this helps!

Another reason I would avoid B is pronoun issue. What is 'they' referring to companies or the cybersquatters?

Very good points! Thank you!