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Correct answer: C
Explanation
A is incorrect because the passage frames intermittency as a solvable 'engineering problem' requiring broader action beyond just upgrades. B is incorrect because the passage acknowledges cost and hurdle issues while arguing for a path forward, not ignoring them. C is correct because this option synthesizes the initial claim (renewables are key) with the complication (structural hurdles) and the ultimate conclusion (policy + investment is the solution). D is incorrect because the passage suggests policy commitment and private participation as necessary components, rather than relying solely on foreign capital.