单选题

　　 【阅读选择】Helping the planet is a big part of what our world trip is all about and that’s exactly what we did this past week. We helped get a hydroponics farm started in a local village. This farm will be a model for the local villagers so they can start their very own self sustaining farm. Hydroponics is a type of farming that uses a third of the water needed in an average farm and uses no soil. A hydroponics farm _______________.

　　 A、is difficult to build

　　 B、is a type of farm without soil

　　 C、will cost lots of money

　　 D、was started in the village before they came