Final answer:
The subject pronoun that matches the subject in the sentence 'Pedro, Teresa y Alberto practican deportes' is 'A ellos'
Step-by-step explanation:
The subject pronoun that matches the subject in the sentence 'Pedro, Teresa y Alberto practican deportes' is A ellos. The pronoun 'ellos' is used to refer to a group of males or a mixed group of males and females.
Learn more about Subject pronouns in Spanish