Select the correct and entire subordinate clause of the sentence. a survey revealed that over 80 percent of polluters meet the federal regulations. the subordinate clause is

The correct answer is "that over 80 percent of polluters meet the Federal regulations2".

The subordinate sentence begins with a relative pronoun "that" in this case, all the since from that word to the full stop forms the subordinate or dependent clause, it is adding detail about the noun, which is one of the functions of this kind of clauses.

the correct answer is the first one.