Answer:
The sentence that shows correct subject-verb agreement is sentence A.
Step-by-step explanation:
Subject-verb agreement means that the subject and the verb must agree in number. That is, both need to be singular or both need to be plural. The indefinite pronouns (anyone, everyone, someone, no one, nobody) are always singular, so they require singular verbs. In the sentence above, both call and ask are singular, making A the right choice.