The sentence that uses the underlined pronoun correctly is:
B: It was clear that the council member herself supported the plan.
In this context, "herself" is used correctly to emphasize the subject, "the council member."
The other options have incorrect usage:
A: "itself" is not appropriate here as "Max" should be referred to with a different pronoun (like "himself" if Max is male).
C: "ourselves" is incorrect because the subject "you" does not align with the reflexive pronoun "ourselves."
D: "themselves" is correctly placed in "make the cupcakes," but it should be aligned with "the kids" as in "make the cupcakes by themselves."