[单选题]What do video cassettes, ice cream, pizzas, whisky and bouquets of flowers all have in common? The answer is that in Japan they can all be bought from a vending machine (自动售货机). Japan boasts more vending machines per person than any other country in the world, with one for every 22 people. America, by contrast, has one for every 46; the European community only for every 200.What is the purpose of the question raised at the beginning of the paragraph?（） A To explain what kinds of products Japanese people like.  B To show how vending machines are widely used in Japan.  C To show the varieties of everyday necessities available in Japan.  D To explain the reason which makes Japan proud of its prosperity.