Which one of the following does the author mention as a source that was ... ...

Which one of the following does the author mention as a source that was used in gathering information for the text that this passage introduces?
(A) critics’ reviews of productions in which Tucker performed
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Oct 2012 LSAT (PT 67): Reading Comprehension