the correct answer is C. think of it this way, if the number of live concernts in the country have decreased, then it's no wonder the number of audiences who will ATTEND the concerts will decrease. Then the decrease in number of audiences to the concerts is not as result to people preferring records over live performances, thus the conclusion will be wrong. B is wrong, because it is about OPINION, not AVAILABILITY of concerts. Even if people had the OPINION of going to the concerts, they might still not want to go due to the CONVENIENCE of recordings, that will not contridict with the argument's conclusion. So by using the denial test, C is correct.