题目内容：
根据以下材料回答：
What does a house mean in the United States?
A) It is a dream which many people can hardly realize.
B) It is so expensive that many people cannot really buy them.
C) It is the most important property that many people try to buy.
D) It doesn't belong to people if they can' t borrow money from the bank.
参考答案：
答案解析：