What represents a fundamental responsibility of trade unions?

Trade unions have a fundamental responsibility to negotiate work conditions for their members. This includes advocating for better wages, working hours, safety regulations, and other benefits that directly affect the workers' lives and working environments. By representing the collective interests of employees, unions play a crucial role in balancing the power dynamics between employers and employees, ensuring that workers have a voice in the workplace and a platform to address their grievances. This negotiation process is central to the purpose of trade unions, making it a critical function that supports the overall well-being and rights of workers.

The other options focus on aspects that are more aligned with business interests or external relations rather than the direct advocacy for workers' rights, which is the primary duty of trade unions.