What is the primary function of a constitution?

The primary function of a constitution is to outline the structure and function of government. A constitution serves as the foundational legal document of a nation, defining the framework within which the government operates. It establishes the various branches of government — typically the executive, legislative, and judicial branches — and delineates their powers, responsibilities, and relationships to each other and to the citizens.

A constitution plays a critical role in setting the rules under which political authority is exercised and often includes provisions on the rights of individuals and the processes for governance. By providing a clear structure, it helps ensure that power is distributed and limited, thus preventing any branch from becoming too powerful.

The other choices, while related to government functions, do not encapsulate the primary role of a constitution. Creating economic policies is a task typically undertaken by the government within the framework established by the constitution, rather than a function of the constitution itself. Enforcing laws is a responsibility of the executive and judicial branches as defined by the constitution. Conducting foreign relations falls under the purview of the executive branch, also structured by the constitutional framework. Thus, outlining the structure and function of government is the essential role of a constitution, making this the correct answer.