Question ID:PT67 S4 Q24 Passage:Nightbird is an unsigned painting that some attribute to the celebrated artist Larocque. Experts agree that it was painted in a style indistinguishable from that of Larocque and that if it was not painted by Larocque, it was undoubtedly painted by one of his students. A recent analysis showed that the painting contains orpiment, a pigment never yet found in a work attributed to Larocque. Therefore, the painting must have been done by one of Larocque's students. Stem:Which one of the following, if true, most weakens the argument? Correct Answer Choice:CChoice A:Few of Larocque's students ever used painting techniques that differed from Larocque's. Choice B:Larocque never signed any of his paintings. Choice C:No painting currently recognized as the work of one of Larocque's students contains orpiment. Choice D:None of Larocque's students is considered to be an important artist. Choice E:The use of orpiment became more popular in the years after Larocque's death.