After studying the behavior of chimpanzees, Jane Goodall, a young researcher, decided to live in Gombe Stream National Park. When she observed the chimps that's when she realized that they used tools just like humans.
Which choice most effectively combines the two sentences at the underlined portion?
chimpanzee behavior, at the intersection of tool use and humanity, was what Goodall realized she wanted to study afterwards.
and realizing that chimpanzees used tools just like humans, Goodall decided to live in Gombe Stream National Park.
the tool use and humanity at the intersection, which was chimpanzee behavior, was noticed by Goodall, and she decided to live in that park.
Goodall decided to live in Gombe Stream National Park because she noticed, when observing the chimps, that they used tools just like humans.
Correct Answer: D
Choice D is the best answer. It links the decision to the realization logically: She decided to live there because she noticed a specific behavior.
Choice A is incorrect because it shifts the focus to the abstract intersection rather than the action. Choice B is incorrect because it awkwardly combines realization and decision. Choice C is incorrect because "the tool use... was noticed by Goodall" is passive and wordy.