The correct option is A Fair trade coffee consistently earned greater profits than regular coffee earned.
This question requires a careful study of the given graph. If you take a look at the graph then the most stable line, the one that is between 120 - 140 on the amount scale refers to the fair trade coffee profits in Tanzania between the years 2000-2008 as compared to regular coffee which rises and falls anywhere between 20-80 in the same time period. This is the first conclusion that the reader comes across. So, option A is the answer.