At most restaurants, the more food you order, the more money you have to pay. There are, however, many instances where you go to an overpriced "gourmet" restaurant where the plates are tiny but very expensive, or to a cafeteria where the portions are huge and the prices cheap. If you collect data at SEVERAL restaurants, mixing both the expensive "gourmet" type and the cheap cafeteria type, the correlation between the amount of food served per person and the price paid for it should be:
A. Positive and fairly strong
B. Negative and fairly strong
C. Fairly weak