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.
I've never read "Charles" but I would say it would be
C) <span>Laurie's teacher, who prides herself on being calm, loses her temper.</span>
Tom and Amanda are both fragile and compliant. This is symbolized by the glass style of the play. They are like a glass that is easily broken and very fragile. However, they are compliant with the arguments that a person would tell to the public and they easily obey the laws.
I think so. No bs B seems right.