Tu because If you put Mi or mis son rojos it says my are red which dosen't really make sense. Since you put tu in front of son (plual) it would be they are red.
I have bolded each right answer. Also translated each answer choice so that you know what each word means.
1. What would you use to sharpen a pencil?
A- el sacapuntas ← means the sharpener
B- el escritorio ← means the desk
C- la papelera ← means the paper bin
D- la pantalla ← means the screen
2. What would you look at to tell the time?
A- el reloj ← means the watch or clock (in Spanish there is one word for both watch and clock)
B- la bandera ← means the flag
C- el teclado ← means the keyboard
D- la puerta ← means the door
3. Which of these would you sit in to study?
A- el ratón ← means the mouse
B- la ventana ← means the window
C- el cartel ← mens the poster
D- la silla ← means the chair
Answer:
D)
Explanation:
This is the translation: A. Water the flowers
OR
B. Caring for children
OR
C. Wash clothes
OR
D. Take out the trash so, D)