Which choice best describes the overall structure of the text?

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Community science, which involves professional scientists collaborating with amateur science enthusiasts to study a topic, is often an effective and engaging way to conduct research. It can offer insight into the daily life of a scientist, spark youth interest in science, and increase the amount of data researchers can collect. This approach was essential to the success of a study by biologist Abbigail Merrill and colleagues of how weather relates to a butterfly's flower choice, which included findings from hundreds of students and community members in northwestern Arkansas.

It describes the development of a type of scientific collaboration, shows how that type of collaboration has been used in a particular field of study, and then suggests future collaborative projects.

It introduces the topic of a scientific study, describes the study's importance, and then presents the study's results.

It identifies a particular approach to research, lists some benefits of that approach, and then mentions a study in which that approach was used.

It argues for a new approach to scientific research, comments on the public's opinion about the approach, and then describes how that approach was applied in a certain study.