The question is asking about the setting of the book? Since you don’t have it posted I’d just scan through the beginning to try and determine the time & place
B. mis, mi. The first one is plural and second is singular.
Diez. The question says "Twenty divided by two is". The answer is ten, in Spanish that's... diez.
Answer:
-El viernes a las cuatro de la tarde, la profesora Mora asistió a una reunión de profesores
-A la una, yo llegué a la tienda con mis amigos
Explanation: