An ecologist is studying the effects that a population of predators is having on a population of prey. He used data from the field to produce this line graph. Which conclusion can you draw from the graph? A. There is no relationship between the population of predators and prey. B. The population of prey decreases with a decrease in the population of predators. C. The population of prey increases with an increase in the population of predators. D. The population of prey decreases with an increase in the population of predators.