Which of the following sentences contains a correct example of subject-verb agreement?

The sentence "The lady with her dogs walks every morning" demonstrates correct subject-verb agreement because the subject "lady" is singular, and the verb "walks" correctly matches it in number. In English grammar, a singular subject requires a singular verb form. The additional phrase "with her dogs" does not affect the subject-verb agreement because it is not part of the main subject; the main subject remains "the lady."

In contrast, the other sentences contain subjects that lead to disagreements between the subject and the verb form. A good understanding of subject-verb agreement is critical, as it ensures clarity and correctness in writing.