Which best describes a rule for subject-verb agreement? phrases or clauses should never separate subjects and verbs. compound subjects joined by “and” are never plural. singular subjects have singular verbs. plural subjects can have singular or plural verbs.

The correct answer is C. A rule for subject-verb agreement is: singular subjects have singular verbs.

Consider this example: The girl jumps on the trampoline. Here, both the subject (the girl) and the verb (jumps) are singular.
Likewise, plural subjects have plural verbs. Consider this example: The girls jump on the trampoline. Here, both the subject (the girls) and the verb (jump) are plural.