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.
Assuming you are talking about America in general using the statement American.
-Valuing what other cultures offer
-Respect for differences
-Recognition of an abundant diverse amount of cultures
I am the interloper in this story