Hi !
Hablar
Imperativo =
Habla (tu) (accent on the u)
Hable (él, ella, Ud)
Hablemos (nosotros)
Hablad (vosotros)
Hablen (ellos, ellas, Uds)
As you can see, Usted conjugates as "él, ella" and "Ustedes" as "ellos, ellas"
hope I helped
1. Tienes que trapear el piso en lunes
2 tienes que cortar la yarda el viernes
Chica is feminine... reservada is feminine... so which of your options are feminine? Ella and la. Ella means she so it can't work, as that would mean she girl is very reserved. La is the femenine the. So that is your answer.