The answer would be los. So option 3.
Andrea los mira.
1. fast
2. hot
3. empty
4. expensive
5. lazy
6. cold
7. happy
8. slim
9. slow
10. dirty
11. poor
12. old
13. heavy
14. clean
15. dry
16. young
17. fat
18. wet
19. light
20. difficult
21. easy
So for the usted form, you use the 3rd person singular of the present subjunctive instead of the 2nd person singular present indivatice so, 'hable'