The recent discovery of ancient artifacts unequivocally provides undeniable proof of an advanced civilization.

The correct answer to the question "The recent discovery of ancient artifacts unequivocally provides undeniable proof of an advanced civilization." is Option C: provides undeniable proof of.

The other options — A) unequivocally provides undeniable proof of, B) unequivocally provides proof that there was, D) provides proof that there was undeniable evidence of — are incorrect for this GMAT Exam Prep question. As explained above: The words 'unequivocally' and 'undeniable' are redundant as they convey the same meaning of certainty. Using both makes the sentence unnecessarily verbose. Option C removes the redundancy while maint…