The government gave money to people to help buy homes outside of the cities. This system of subsidized housing caused many people to leave urban areas.
【正确答案】 A
【答案解析】解析：题干中subsidized“补贴的”，选项中aided“帮助的”，invested“投资的”， sustained“持续的”，provided“预备好的”，选项A最接近题干意思。