Which verb correctly completes the sentence?

On the magazine cover, a baby with chubby cheeks __________ directly at the camera.

A.
smile

B.
smiles

To determine which verb correctly completes the sentence, we need to consider subject-verb agreement. The subject of the sentence is "a baby with chubby cheeks." Since "a baby" is a singular noun, we need to use a singular verb form.

Option A, "smile," is the plural form of the verb, so it is not correct.

Option B, "smiles," is the singular form of the verb, which matches the subject. Therefore, the correct verb to complete the sentence is "smiles."

To determine the correct verb form, we need to understand subject-verb agreement rules and identify the subject of the sentence. In this case, knowing that "a baby" is singular helps us choose the correct form of the verb.