Concept:Centralization of political power means concentrating authority in one central government, making it easier to change laws and expand control when necessary.
Explanation:A flexible constitution can be amended or changed through ordinary legislative procedures.
This makes it easier for the central government to increase its powers and reduce the powers of smaller units.
In contrast, a rigid constitution is difficult to change, so it often protects the powers of states or regions and encourages decentralization.
A written constitution usually contains detailed rules that may limit quick changes.
An unwritten constitution depends on customs and conventions, but it is not necessarily designed for easy central control.
Therefore, for a government that wants to centralize political power effectively, a flexible constitution is most suitable because it allows quick constitutional adjustments whenever the central authority needs more power.
Answer:D. Flexible constitution