Final answer:
The workings of the federal system are often referred to as intergovernmental relations, encompassing the interactions and collaborations between different levels of government within the country. Hence, option C is correct.
Step-by-step explanation:
The workings of the federal system are sometimes called intergovernmental relations. This refers to the interactions between the national government and the state governments, along with the methods and systems by which these governmental entities collaborate and coordinate their efforts.
Intergovernmental relations cover a range of activities and policies, from the administration of health and safety programs to national defense and interstate commerce. The term captures the essence of the federal system, where sovereignty is divided between the central government and the regional governments, and where both levels of government must interact to govern effectively. Therefore, the correct answer is option (C).