Which of the following sentences demonstrates proper subject-verb agreement?
A. The boy or the girls come to school late.
B. The boys and girl in our club is in the cafe.
C. The boys or the girls sings in the choir.
D. The boys and girl visits my house.
"The boy or the girls come to school late," the verb "come" correctly agrees with the plural subject "girls" since the presence of either the boy or the girls triggers a plural verb.
Therefore, the Correct Answer is A.