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The correct answer is that staffing firms cannot terminate employees based on their union activities because doing so is a violation of labor laws. Specifically, the National Labor Relations Act (NLRA) protects employees' rights to engage in union activities, which includes forming, joining, or assisting labor organizations. This legal protection is designed to ensure employees can advocate for their rights and interests without fear of retaliation or discrimination from their employers.

Termination based on union activities would not only undermine the rights of the employees but could also lead to significant legal consequences for the staffing firm, including potential penalties and the requirement to reinstate terminated employees. This legal framework is an essential aspect of labor relations, serving to balance the interests of employers and the collective bargaining rights of employees.

Other options might suggest conditions under which termination could take place but they overlook the fundamental protection offered to employees engaging in union activities. Therefore, the affirmative action of terminating an employee for such reasons is explicitly prohibited by law.