GRE General Test: SE-213083 GRE Sentence Equivalence

Though one cannot say that Michelangelo was impractical designer, he was, of all nonprofessional architects knows, the most_____in that he was the least constrained by tradition or precedent.
Select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning