阅读下面材料，然后从各题所给的四个选项中选出一个最佳答案。
C
My friend John has got a restaurant(餐馆) in a big city. It is near a supermarket. He gets ten robots for the restaurant. Each robot costs (价钱为) 20,000 yuan. The restaurant is not big, but very popular（受欢迎的）. Now more and more people come here for dinner.
The robots have different jobs in the restaurant. Two robots cook different kinds of food; one washes the dishes; one cleans the floor and the others give food to the guests (客人).
Although robots do most of the jobs in the restaurant, John is still very busy. He must do many things to keep the robots working well. Luckily, John is good at studying robots and he knows robots very well. I think in the future, there will be a lot of robot themed restaurants (机器人主题餐厅) around the world.
