The correct answer is C) Chimps remember numbers and enjoy puzzles
Step-by-step explanation:
The purpose of an outline is to summarize the content of a text by stating the main idea and supporting details or information that explain this. In the case of the outline presented, the main idea is how the research by Jane Goodall changed the understanding of society about chips. Also, this outline presents two supporting details that show two findings that change the complexity of chips behavior; one is how chips form complex groups and how they have complex emotions.
According to this, the third supporting detail should be a characteristic of chips observed by Goodall that also changed the perception about them. Thus, the best option is "Chimps remember numbers and enjoy puzzles" because this is mentioned in the text "Later studies show that chips have number memory (they can remember numbers one through nine), and like humans enjoy doing puzzles for the fun of it" and also was one key finding that change the perception about chips.