The only conjunction in this sentence is C) but.
All of the other options are prepositions, not conjunctions.
<span>It promises the scope, purpose, and direction of the essay.
If I wrote an essay on vegetarianism, I would discuss why meat is bad for you. You gotta have a purpose when writing an essay.</span>
Though he once treated Ivan as if he were almost his son, his life kind of went sour after his wife left and he grew less attached to Ivan, who was a sore spot in their marriage. These days, Mack drinks and his ethics are, well, questionable.
