Is that rest of the question? : because I'm willing to help out more but you need to provide more information since all I could do is speculate what you're trying to asked.
Answer:
Caerse.
Explanation:
Reflexive verbs are transitive verbs whose action falls on the same subject that performs it.
To conjugate a reflexive verb, the verb is always combined with the corresponding reflex pronoun, which precedes it.
Reflexive verbs indicate that the subject performs an action that falls on itself. For this reason, the reflexive pronoun must always coincide with the subject in person and number.
Part D
1.conocí (yo)
2.fuiste(tu)
3.estuvimos(nosotros)
4son(ellos)