Option C is correct because the textbook explicitly states that one of the key functions of the constitution is 'to specify who has the power to make decisions in a society' and 'decides how the government will be constituted.' The context further clarifies that the constitution specifies 'how Parliament is to be formed and what are its powers.' This establishes that the constitution is the foundational authority that creates and defines Parliament's structure and powers, making it higher in authority. Option A is incorrect because chronological order doesn't determine authority. Option B is incorrect because the eminence of makers doesn't establish legal superiority. Option D is factually wrong as Parliament can amend the constitution under certain procedures.