It’s definitely not A and B is a no because highlighting /most/ of your text doesn’t help point out the key points or quotes. Determining the authors purpose helps to understand what your reading so I would pick C.
The third choice is the answer
Answer:
Dear [<em>cousin's name</em>],
Hi [<em>cousin's name</em>], how are you? My brother's birthday is coming up soon, but I haven't decided on the birthday gift yet. Do you know what [<em>brother's name</em>] is particularly interested in right now? What do you think would be some possible items on his wishlist?
Thanks!
[<em>your name</em>]
Which poem? There isn't anything besides your question...
I believe fused sentence would be the answer. Because “the mayor...” and “the local classic car auction...” could be two separate stand alone sentences but they were incorrectly fused together by a comma.