Concept:The Commonwealth of Nations is a voluntary association of states bound together by their shared historical connection with the British Empire.
Explanation:The Commonwealth of Nations comprises
54 sovereign states.
Nearly all member states were once British colonies, protectorates, or dominions.
This shared experience of British colonial rule is what binds them together.
Political uniformity is absent, as members include both republics and monarchies.
There is no common currency among member states.
English is widely used, but it is not a uniform common language across all members.
Therefore, common colonial history is the strongest unifying factor among Commonwealth nations.
Answer:D. Common Colonial History