I think the answer is 6 .
A
1-2. huevos / tostadas
3-4. jamón / queso
5-6. ensalada / tortilla
7-8. agua / té
9. helado
10. hambre
11. sed
B*
12-13. las empanadas, los batidos
14. los pinchitos
15. el mesero
16. la cuenta
D
17. bebo
18. aprenden
19. leemos
20. vives
21. recibimos
* "la orden" is what you ask for for eating.
Answer:

Explanation:
Given



Required
Determine its linear expansivity
This is calculated as:








Explanation:
1-Perceive a sensation coming from an external stimulus or from your own body.