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Correct answer: C
Explanation
A is incorrect because the passage explicitly states that renewables alone are insufficient due to infrastructural hurdles. B is incorrect because the passage frames battery storage as only one part of a necessary, dual-pronged approach. C is correct because the conclusion synthesizes the necessity of both renewable addition and grid management for true security. D is incorrect because this option contradicts the passage's central theme of actively moving away from reliance on volatile imports.