Gusta- because you are speaking in the yo form, the answer will be found in the layout of conjugations (pronouns) that goes like this. I=yo : Tú= you : El/Ella/Usted= he, she, or it. : Nosotros=we/us : Vosotros= y'all (this is literally what it means I'm not just ps
1. Prefiere
2. Prefiero
3. Prefieres
4. Preferimos
5. Prefiere
6. Prefieren
7. Prefiere
Answer is “cuando”
¿ Cuando regresas a casa?
______
Va is the correct choice for usted
-native speaker