Concept:A flexible constitution can be amended easily through ordinary legislative processes, whereas a rigid constitution requires a special, more difficult procedure.
Explanation:The United Kingdom has an uncodified, unwritten constitution which is not contained in a single document. Parliament can change constitutional rules through normal legislation, making it flexible.
In contrast, India has a written and partially rigid constitution requiring special majorities for amendment. America also has a written, rigid constitution with a formal amendment process. China has a written constitution that is generally considered rigid.
Therefore, among the given options, only the United Kingdom possesses a flexible constitution.
Answer:D. United Kingdom