The First three words of the Preamble to the constitution , "We the People" is  - that the people are the source of authority that created the Constitution .
What is Preamble
A preamble is an  expressionary statement in a document that explains the  purpose  of documents .
What is Authority
Authority is a real power over a several people or group by a single person or an organization  which can control and give order to others who are under it .
What is Constitution
A constitution is an aggregate of fundamental principles or established precedents that constitute the legal basis of a polity, organisation or other type of entity
Hence Option A is correct ,
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