Which of the Following Is the Best Example of Market

Which of the following is the best 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 government raises taxes on gasoline, which raises the price of gasoline.
C) The grocery store tells her employees to put the sugar-free cereals on the top shelf where adults can find them more easily.
D) The government subsidizes tobacco farmers, which allows the farmers to grow more tobacco.