C gives more power to the individual states
The island nation you are referring to is Sri Lanka. Sri Lanka has two capitals: Colombo, and the other one is Sri Jayawardenepura Kotte.
In return for offering the British throne to William and Mary, it was demanded that all laws had to be approved by the Parliament.
I believe that the answer to the question provided above is the state constitutions provides the most basic info for the need of the the national constitutions.
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