I think estufa makes more sense, because there are usually stoves in kitchens, as opposed to sofas and cars, and it's a better answer then a place to sit down.
Hope this helped!
Answer: Differences: Costumes, in U.S. celebrate his costumes like the independence day 4 of July. In Ecuador Costumes are the 24 of May war. In South America used to make their own medicines with the nature, while in the United States make with diferent types of chemical process in the drugs.
Similarities: Celebrate New year, Christmas and have the same thinking of the science.
Explanation: I think that the answer says all you need to know and this question isn't from spanish, it's from geography.
Answer: 1st: “ocho años que hablo español.”
2nd: “hace 10 meses que ella ha jugado al baloncesto.”
3rd: “hace cinco días que estamos en la clase de teatro”
