However, no testimony shall relate to unpublished material or information or to the reporters' motivations, bias, mental impressions, or other information extrinsic to what the reporter saw and heard, and the reporter shall not be obligated to reveal any confidential sources.

Choose your answer: based on the paragraph above can we conclude that "The reporter's testimony raised publication rates by twenty percent."?

pick from the following.
[a]. Yes;
[b]. It's impossible to say;
[c]. No;
I think the answer is
[b].