What is the primary purpose of the European Union social law?

The primary purpose of European Union social law is to support and complement the social policies of Member States. This framework is designed to help ensure that there are minimum standards and protections for workers across the EU, while also fostering social inclusion, equal opportunities, and the overall improvement of living and working conditions.

By focusing on social policies, the EU aims to promote social justice and solidarity among its member states. This includes directives that cover various aspects of labor law, such as working conditions, health and safety, non-discrimination, and rights related to employment. This approach recognizes the diverse social policy landscapes of the member countries and provides a foundation for enhancing these policies harmoniously throughout the European Union.

The other options do not align with the core objectives of EU social law. Establishing a single monetary policy pertains to economic governance rather than social welfare. Regulating trade agreements with non-EU countries focuses on economic relations rather than internal social policies. Unifying educational standards, while important, does not fall under the specific remit of social law but rather relates to broader educational initiatives. Thus, the selected answer accurately captures the essence of the EU's social law objectives.