Final answer:
The DOJ can choose to bring criminal charges to supplement the SEC's civil action.
Step-by-step explanation:
The correct answer is D) The DOJ can choose to bring criminal charges to supplement the SEC's civil action.
Under US law, insider trading is illegal and can result in both civil and criminal charges. In this scenario, the SEC (Securities and Exchange Commission) brings a civil action against CPA Sobel, forcing her to give up her insider-trading profits and pay a civil fine. However, the DOJ (Department of Justice) can independently investigate and bring criminal charges if they choose to do so, even if the SEC has already pursued a civil case.
It is important to note that the DOJ has jurisdiction over matters involving insider trading and can bring criminal charges regardless of whether the SEC declines to pursue the case or not.