Answer:
The sentence that is grammatically correct is:
D. Ellos salen a jugar a la calle.
Step-by-step explanation:
Yo salgo/ Tu sales/ Él sale/ Ella sale/ Nosotros salimos/ Ellos salen.
As we speak of the pronoun "Ellos", the correct conjugation for the verb "salir" in Spanish would be "salen".
A. "Salir" is not conjugated to the pronoun "ellos" .
B. "Sales" is not conjugated to the pronoun "ellos", it would work if the pronoun were "Tu".
C. It is not correct to conjugate the verb as "Salis" for the pronoun "Ellos"..