Refer to the Figure

Refer to the figure.
If the data collected for the graph were not gathered simply to describe the hearing abilities of the fly, then (for the biologists who did the research) the graph constitutes a

A) hypothesis on why the fly species has been able to survive to the present.
B) test of a prediction on fly hearing ability, based on the kind of sound frequencies produced by crickets.
C) check on the prediction that crickets should have evolved the ability to avoid their fly parasites.
D) test of the hypothesis that fly hearing abilities are designed to help the species maintain a stable or growing population.