TOEFL Listening: TPO-TOEFL阅读TPO - 5ZE1UT8PAJRCT8XTN$

Why does the author indicate that "The fifth species was not aggressive, and its nests were randomly distributed over the study area"? A. To identify research results that contradicted Hubbell and Johnson's original hypothesis B. To indicate that research results confirmed that nest distribution was related to aggressiveness C. To introduce the hypothesis that, within the same species, not all colonies are aggressive D. To point out that both aggressive and nonaggressive species are equally successful at finding nest sites