根据短文内容， 从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
  If you are growing tomatoes in your backyard for sale you are producing for the market. You might sell some to your neighbor and some to the local manager of the supermarket. But in either case, you are producing for the market.      If people stop buying tomatoes, you will stop producing them.
If you take care of a sick person to earn money, you are producing for the market. If your father is a steel worker or a truck driver or a doctor or a grocer, he is producing goods or service for the market.
  You may spend money in stores, supermarkets, gas stations and restaurants. Still you are buying from the market. When the local grocer hires you to drive the delivery truck, he is buying your labor in the labor market.
   But for each person or business that is making and selling something, it is very concrete(具体的). If nobody buys your tomatoes, it won’t be long before you get the message. ____ It is telling you that you are using energies and resources in doing something the market doesn’t want you to do.

A．The market may be something abstract.

B．The sellers are always smarter than buyers.

C．When you spend your income, you are buying things from the market.

D．The market is a concept.

E. One has to make his ends meet when shopping.
F. The market is telling you something.
G. Your efforts are being directed by the market.