Males of the marine isopod Paracerceis sculpta come in three sizes: large alphas, medium betas, and small gammas. When the average fitness of each type was measured, researchers found that there were no statistically significant differences among the three types. This suggests that these three male sizes are an example of
A) a conditional mating tactic. B) an alternating mating strategy. C) intersexual selection. D) cryptic female choice.