单选题：根据下面资料，回答题 In 1959 the average American family paid $ 989 fo

根据下面资料，回答题
In 1959 the average American family paid $ 989 for a year' s supply of food. In 1972 the family paid$ 1,311. That was a price increase of nearly one third. Every family has had this sort of experience. Everyone a-grees that the cost of feeding a family has risen sharply. But there is less agreement when reasons for the rise are be-ing discussed. Who is really responsible?
Many blame the farmers who produce the vegetables, fruit, meat, eggs, and cheese that are stored for sale.According to the U. S. Department of Agriculture, the farmer' s share of the $ 1,311 spent by the family in 1972was $ 521. This was thirty-one percent more than the farmer had received in 1959. But farmers claim that this in-crease was very small compared to the increase in their cost of living. Farmers tend to blame others for the sharp risein food prices. They particularly blame those who process the farm products after the products leave the farm. These
include truck drivers, meat packers, manufacturers of packages and other food containers, and the owners of storeswhere food is sold. They are among the "middlemen" who stand between the farmer and the people who buy and eatthe food. Are middlemen the ones to blame for rising food prices?
Of the $ 1,311 family food bill in 1972, middlemen received $ 790, which was thirty-three percent more thanthey had received in 1959. It appears that the middlemen' s profit has increased more than the farmer' s. But some e-conomists claim that the middlemen' s actual profit was very low. According to economists at the First National CityBank, the profit for meat packers and food stores amounted to less than one percent. During the same period all oth-er manufacturers were making a profit of more than five percent. By comparison with other members of the econom-
ic system, both farmers and middlemen have profited surprisingly little from the rise in food prices.
Who then is actually responsible for the size of the bill a housewife must pay before she carries the food fromthe store? The economists at First National City Bank have an answer to give housewives, but many people will notlike it. These economists blame the housewife herself for the jump in food prices. They say that food costs morenow because women don' t want to spend much time in the kitchen. Women prefer to buy food which has alreadybeen prepared before it reaches the market.
What is the main topic of this passage? A．Food supply.
B．Profit earned by farmers, middlemen, and housewives.
C．Reasons for the food price increase.
D．Economists' attitudes.