Final answer:
The subject pronoun that you would use to talk about Paola and Teresa is ellas.
Step-by-step explanation:
The subject pronoun that you would use to talk about Paola and Teresa is ellas. In Spanish, subject pronouns are used to replace the subject of a sentence. Since Paola and Teresa are females, the correct subject pronoun is ellas, which means 'they'.
Learn more about Subject Pronouns in Spanish