Answer:
The correct answer is se peina.
Explanation:
Reflexive verbs are those that are used to demonstrate an action that the subject performs on himself.
The actions that one performs on oneself are combing, dressing, sleeping, lying down, etc.
In the case of the verb “Peinar”, this is the way in which it is conjugated for each person in Spanish:
Yo me peino
Tú te peinas
Él se peina
Ella se peina
Usted se peina
Nosotros/as nos peinamos
Ellos/as se peinan
Ustedes se peinan
