The verb, ser, is in the singular el/ella/usted tense, meaning that the subject is only one person or thing. This eliminates the two middle choices, as they are multiple people.
Next, the adjective. Alto is in the masculine form, so Maria, as it is a girl name, is also able to be eliminated.
We do sports Nosotros practicamos deportes We re doing sport . Nosotros estamos practicando deporte carmen come en casa. Carmen come en casa carmen esta comiendo en casa Carmen está comiendo en casa