As the countryside fills up, people are becoming more aware of the need for open space, "open space" means ______. A: public land B: unoccupied land C: unplanted land D: private land

"… , people are becoming more need for open space." (Paragraph 1) tells us that ____. A: people are thinking to develop their living space into the sky B: people noticed the need for unoccupied land C: people are struggling to get more land from the space D: people are becoming more active on the space issue