Final answer:
The correct verb form to complete the sentence is desayuna.
Step-by-step explanation:
The correct verb form to complete the sentence is desayuna.
In the sentence, Marisol desayuna leche, cereales y yogurt, the subject Marisol is singular, so the verb form must also be singular. Desayuna is the third person singular form of the verb desayunar which means 'to have breakfast'.
On the other hand, desayuno is the first person singular form of the verb desayunar, desyunan is the third person plural form and desayunamos is the first person plural form. But in this sentence, the subject Marisol is singular, so only desayuna is the correct verb form.
Learn more about Spanish verb conjugation