Put "no" after the verb when forming a question
Thx you made my day take care your amazing too :)
The conjugations of dormir in past tense are..
Yo - dormí
Tú - dormiste
Él/Ella/Ud. - dormió
Nosotros - dormimos
Ellos/Ellas/Uds. - dormieron
So the answer is A, dormimos.