Answer in bold and underlined.
Answer: Isabel y Valentina son amigas. Están emocionadas porque hay una fiesta el viernes.
Translation : Isabel and Valentina are friends. They are excited because there is a party on Friday.
Explanation about the sentence:
"Están" is the correct way to conjugate the verb "to be" in the third person plural, since it refers to Isabel and Valentina, who are two people. The verb "to be" is used to indicate a temporary or situational state, in this case the emotional state of Isabel and Valentina. Therefore, "están" is the correct way to conjugate the verb in this context.