According to Rule 702(b) and 702(c), expert testimony must be based on what?

The correct answer focuses on the necessity for expert testimony to be grounded in reliable and relevant facts or data that come from sound methodologies. This is crucial because expert testimony is often used to help establish evidence or clarify complex information in legal proceedings.

Rule 702(b) emphasizes that an expert must use sufficient facts or data as a foundation for their testimony, ensuring that their contributions to a case are not merely speculative. Similarly, Rule 702(c) underscores the requirement that expert testimony must derive from techniques or principles that are generally accepted and relied upon in the field. Utilizing sound methodologies ensures that the expert's findings are credible, scientifically valid, and applicable to the case being addressed, which is paramount in maintaining the integrity of the judicial process.

Options that suggest reliance on personal opinions or experiences, peer-reviewed articles, or general knowledge do not fully capture the rigorous standards laid out in the rules. While those elements can be part of the expert's testimony, they must ultimately be supported by facts or data obtained through rigorous methodologies to qualify as expert evidence under the rules.