Official Explanation

A

The word “as” signals a continuation of ideas—the vocals were hard to hear because of the way the recordings were mastered. The answer is (A) maladroitly, which means “unskillfully” or “bunglingly.” Choices (B) copiously, (C) ingeniously, and (D) shrewdly are not in line with what you’re looking for—these words suggest more time and care than was spent. Choice (E) maliciously is too harsh. It’s doubtful the recordings were mastered with intent to harm.