Question

after the huge thanksgiving dinner, my brothers and sisters wished that he or she had not stuffed themselves so much because mom was ready to serve everyone her famous peanut butter pie.
○ change themselves to him or herself.
○ change everyone to them.
○ no change is necessary.
○ change he or she to they.

Explanation:

The sentence refers to multiple people ("my brothers and sisters"), so the pronoun must be plural to match the plural antecedent. "He or she" is singular and incorrect here; changing it to "they" creates proper pronoun-antecedent agreement, and the rest of the sentence's pronouns/verbs align with this correction.

Answer:

O Change he or she to they.