Answer :
"everybody" is in agreement with singular verbs, think about it as each person": the correct answer is the one where both verbs are in singular form: b. When Professor Jones lectures, everybody listens and takes notes.
Answer: b. When Professor Jones lectures, everybody listens and takes notes.
Explanation: Subject-verb agreement is simply to use singular verbs with singular subjects and plural verbs with plural subjects. Indefinite pronouns like anyone, everyone, someone, no one, nobody are always singular and, therefore, require singular verbs. In the given sentence we have the indefinite pronoun "everybody" and it requires singular verbs, so the correct answer would be "When Professor Jones lectures, everybody listens and takes notes."