An unwritten Constitution is

A.

entirely based on case laws

B.

completely sourced from parliamentary law

C.

partially written and based on convention

D.

completely unwritten and based on convention

Correct answer is C

An unwritten constitution is partially written and based on conventions.

F. Adigwe (1974) defined unwritten constitution as that made up of several enactments and conventions like the British constitution. He also pointed out that an attempt was made to codify some of, but not all, the rules and principles, during the regime of Cromwell.