The 3rd option is correct :)
What does Gaston and Lucia decide to do? follow the recommendation of WHO? Why gastón and lucía want to get tickets for students? How and when can they get tickets for students? What happens when they arrive at the school office? What do they ask the secretary? Do you think they get the tickets?
Pienso:
Envían
Mantiene
Olen
Gustamos
Quedas
Estar
Estar
Ser
Hi !!
They (feminine) respond ==>
<u>Ellas responden</u>
responder = to respond ==> <u>infinitivo</u>
they masculine = <u>ellos</u>
they feminine = <u>ellas</u>
RESPONDER <em>(presente)</em>
responde (yo)
respondes (tú)
responde (él/ella/ Ud)
respondemos (nosotros)
respondéis (vosotros)
responden (ellos/ellas/Uds)
gerundio = respondiendo
participio pasado = respondido
hope this helps :)