Answer:
According to your choices it has to be:
Ellos duermen.
Explanation:
But the right
Way to translate in Spanish is
Ellos están durmiendo.
The answer to your question is B) estas
Depends on what you want to say, since "Tomar' has two meanings.
"Tomar", as in drinking and "tomar", as in taking.
I honestly don't think there's actually a formal way of saying tomar. It depends on the sentence & how you want to address the person.
Ex. Usted se puede tomar el agua? Can you drink the water?
Ahora, ustedes tomaran el examen > Now, you'll take the exam (but in a polite way!)
If you have any more doubts feel free to ask me!