The plural subject pronoun to use when referring to Felipe and Arianna would be "they".
To talk about Felipe and Arianna as a plural subject, you would use the pronoun "they".
To determine the plural subject pronoun to use when referring to Felipe and Arianna, you would combine their individual subject pronouns. In this case, Felipe's pronoun is "he" and Arianna's pronoun is "she," so you would use the plural subject pronoun "they." By combining "he" and "she," the plural form becomes "they."
