Anyone can me to understand this? if they can explain the answers as well, they get brainliest!

I originate from being mexican, my best guess for this question is that it is asking you to replace "la casa" with the choices of 1-6 below.

in english it says

"the house.

lupita, where is your house?"

which doesn't make sense so you would want to pick number 2. La hermana

so it is able to say  

"la hermana

Lupita, ?donde esta tu casa?"

translating to

"the sister,

lupita, where is your house?"

answer is a: las

explanation:

the reason for this answer is becouse it's a plural frase which talks more then one thing