SAT English Practice Question

The author, a skilled neuroscientist, recounts the events that led her to this discovery. She notes that scientists in the field had long believed the opposite was true, but she was skeptical of this belief because she had personal experience that contradicted it. What is the purpose of the last sentence of the passage?

1. A.conclude the passage by providing an example.
2. B.emphasize the importance of the author’s personal experience.
3. C.introduce the author’s next line of reasoning.
4. D.explain the author’s disbelief in the traditional belief.