I also agree that the answer is B: whom
in this sentence you are using the preposition + whom grammar structure. Whom is considered an object pronoun and is used when asking who will receive the action, which in this case, I believe is, baking those cookies. Hopefully this makes sense and good luck.
1. incorrect
2. correct
Hope I helped
Answer:
I once got kicked by a horse
Explanation:
This is the only really interesting fact about myself anyways have a nice day/night :)
