Which of the Following Is an Example of Market Coordination

Which of the following is an example of market coordination?

A) Bad weather wipes out half the pineapple crop in Hawaii, the price of pineapples rises, and consumers cut back on their purchases of pineapples.
B) The manager of a grocery store notices that his customers are buying tomato soup about as quickly as he puts it on the shelves, so he orders more tomato soup from the wholesaler.
C) The manager of a grocery store tells her employees to put the sugar-free cereals on the top shelf where adults can find them more easily.
D) a and b
E) a, b, and c