Answer:
For optimal health, eat plenty of fresh fruits and vegetables, excercise regularly, and sleep at least seven hours at night.
Step-by-step explanation:
In this sentence, a list of actions are enumerated creating paralellism. The grammatical elements that are used to represent actions in English are verbs. So, to coherently complete this list, the component must be headed by a verb in infinitive form. In this case, we have these verbs in infinitive form: eat, excercise and sleep.