g.oogle translate that 100% whoever your teacher is is evil lol I am so sorry you have to do all that
“In the future”
So is the first one, “habrán cambiado”.
Explanation:
If you put the 3rd one is wrong because is talking in the present form, like now and not something that is going to happen in the future and that is not what the sentence is stating.
C. estufa
Because estufa means stove, while butaca is a seat, carro is a car/trolley and sofá means sofa.