Concept:An unwritten constitution is flexible because it draws from customs and conventions, not only a single legal document.
Explanation:Unwritten constitutions are built from practices that have gained acceptance over time.
This means customary laws and conventions are fully recognised as part of the constitution.
So, the main advantage is that the constitution can include these long-standing traditions and political norms.
Option A is incorrect because unwritten constitutions are often harder for ordinary citizens to grasp.
Option B is too narrow, since not every country with an unwritten constitution has a monarchy.
Option D is also wrong because unwritten constitutions are usually easier to amend through ordinary laws.
Therefore, the best description of its advantage is that it contains customary laws and conventions.
Answer:C. contains customary laws and conventions