Complete the detective's response to the prime suspect's rather creative alibi. Select the grammatically correct phrase.

"You claim you were abducted by aliens during the museum heist. ____, you still left your fingerprints on the display case."

The correct answer is Be that as it may.

"Be that as it may" is a fossilized expression using the present subjunctive ("be"). It functions as a concessive phrase, meaning "even if that is true" or "nevertheless." The other options do not grammatically exist in this fixed idiom.