Political scientists from ancient greece to current times all generally agree, is critical to a stable-happy society. a. a constitution with detailed language and rules b. legitimate government institutions c. a unified language, and national sense of self d. a large middle class e. distinct authority in the hands of a single top executive

The answer is A: a constitution with detailed language and rules.  

 A constitution is a set of political principles, that are guides to help a state to be governed, specially in relation to the people it governs, presenting the rights of the people. Also, it seeks to regulate the relationship between institutions of the state, and between individuals and the state.

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