Concept:A constitution sets out the fundamental rules and principles by which a country or organisation is governed.
Explanation:The question describes an agreed collection of regulations, conventions, and customs used for governing.
Sovereignty refers to supreme power or authority, not a set of governing rules.
Suffrage means the right to vote.
Culture represents shared beliefs and customs, not the structure of governance.
Hence, the correct option is A. constitution.
Answer:A. constitution