Final answer:
The Licensing Board generally has the authority to investigate and take action against a licensee in violation of license law. They enforce regulations and impose sanctions as needed. The Attorney General can also be involved in cases of criminal activity.
Step-by-step explanation:
The authority to conduct a public investigation and bring action against a licensee for violating license law typically rests with The Licensing Board (B). The Licensing Board has the power to enforce regulations, hold hearings, and impose sanctions on licensees who fail to comply with laws and regulations governing their professional practice. In some cases, if there is evidence of criminal activity or broader legal issues, the Attorney General (D) might also get involved, as they have the authority to prosecute criminal offenses and pursue legal action in the public interest. However, the primary body responsible for regulating licensees and upholding the license law's integrity would generally be the Licensing Board.