The only preposition in the options available to you is of, so the correct answer is C.
A) and B) are conjunctions.
D) is an adverb.
The answer is going to be A)
Explanation:
i think it's the 3rd one because it doesn't sound like the title is talking about his career. it sounds like it's talking about him personally
***but i have never read this article so just go with your gut feeling!****
