The answer is option 3. el bombero
Quien no trabaja en la oficina?
El bombero no trabaja en la oficina.
I'm not sure if you need the definitions or translations, but I'll give you them.
Explanation:
1. Dance/Dancing
2. Eat
3. Enjoy/Enjoying
4. (Did you mean Corn?) Corn/The corn
5. The Chicken
6. Happy
7. The tail
8. The fruit
9. Celebration/Celebrating
10. Happy/Pleased
11. The chocolate
12. The cake (it's pastel)
13. The soda/The drink
14. Party/Partying
15. The culture
16. The Pineapple (Piña, don't forget your Ñ!)
17. Texan/Texas (?)
18. Fifth of may (Cinco de Mayo)
19. Throw a Party (Dar una fiesta ?)
20. The Hero (?)
21. The fish
22. The Outfit/Suit/Dress
23. The singer
24. The family
25. Mexico
26. Tacos
No
That is the correct form
It refers to the tonic sylable (silaba tónica)
sol (sun) Its a word "aguda"
ra-tón (mouse) Its a word "llana" or "grave"
Mé-xi-co Its a word "esdrújula"
cán-ta-me-lo (sing it to me) its a word "sobredrújula"
Hope this helps u :)