What action can the Board take against someone practicing psychology without a license?

The correct answer is enjoin. Enjoining is a legal term that means to legally prohibit someone from performing a certain action. In the context of practicing psychology without a license, the Board has the authority to seek injunctive relief to stop the unlicensed individual from continuing their practice. This action is taken to protect the public and is part of the regulatory enforcement mechanisms that boards have to ensure that all practicing psychologists meet the necessary qualifications and standards established by law.

While options like reprimand, fine, and terminate may seem plausible in various disciplinary contexts, enjoining is specifically aligned with taking action against unauthorized practice. A reprimand typically refers to a formal expression of disapproval, and while fines can be issued for certain violations, their application may not directly address the immediate issue of stopping someone from practicing unlawfully. Termination usually pertains to employment rather than the specific context of unauthorized practice in psychology.