You use preterite to describe an action that took place and was fully done, Ex. José entro a la habitación, you can see John went into the room, he completed the action. On the other hand, imperfect tense doesn't specificate if the action was completed, Ex. José entraba a la habitación, it doesn't tell us if José fully entered the room.
Is B or C I’m fluent in Spanish and I don’t really know what The expression really mean but I’ll go with C
1. Estoy
2. Llora
3. Intente
4. Busque
5. Eres
6. Puedo
7. Intente
8. Busque
9. Eres
10. Alza
11. Llegaste
12. Cambio
13. Llegaste
14. Triunfo
15. Llegaste
16. Llevo
17. Intente
18. Busque
19. Eres
20. Alza
21. Llegaste
22. Cambio
23. Triunfo
24. Llegaste
Hope it helps :D
