The correct answer is A, all sentences except one is focused on the exhibit. Thereisonly one sentence: did Imention that we had lunch first? which doesnot focus on the exhibit. In addition to that, there is a noticeablemistake when the speaker uses a plural conjugation with a singular object., which is the case of "...there were one painting...". The second closest option would be D,but it isnot completely true, since is fair to say that A ismore accurate as it includes the mistake made by the speaker.