Concept:A country's constitution is the fundamental set of rules that governs the state, and it can be derived from various formal and informal sources.
Explanation:Constitutions may be written or unwritten.
They are usually drawn from sources like statutory laws, judicial precedents, historical documents, and customs and conventions.
Customs and conventions are long-standing practices that have been accepted over time as binding political rules.
Such unwritten norms materially shape how a constitution is developed and interpreted.
Educated elites and civil society organisations only influence constitutional debates, but they are not direct sources of a constitution.
Civil disobedience is a form of protest, not a source of constitutional authority.
Hence, among the given options, customs and conventions are the correct source from which a constitution may be derived.
Answer:D. Customs and conventions