Answer:
It seems that C. Both sources would be beneficial to Bryan's research paper.
Explanation:
Bryan has, in a sense, gotten the best of two worlds. With the book as a source, he has credible information and evidence coming from an expert in the area. Professor jack Taylor has certainly done extensive research and followed academic rules in order to publish his book. Therefore, we can see it as a most valuable source.
On the other hand, with Major Barbara Wilson's interview, Bryan is getting a first-hand account by a woman who is currently serving. She can offer him insights concerning her own and other women's experiences, challenges, feelings, etc. that he may not obtain from the book. This is a less academic source, so to speak, but a more direct one. This source, too, is valuable.
Thus, we can see the both sources would be beneficial to his research paper.