Nightbird is an unsigned painting that some attribute to the celebrated ... ...

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. Which one of the following, if true, most weakens the argument?
(A) Few of Larocque’s students ever used painting techniques that differed from Larocque’s.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Oct 2012 LSAT (PT67): Logical Reasoning B

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