B.) By citing the office to which he was elected
I think that learn about is the answer. :)
I cant really help you but theres a video that talks exactly about how were connected but alone its a tedtalk video and that might help you with this sorry.
Think A is correct. It references Mr. Sparks expertise which lends credence to his subsequent description. Additionally, since the description is in his words, they are surrounded by quotation marks citing to all readers he should get credit for being used in 3rd party research.
C Elizabeth comes across as intelligent and sharp-tongued