The passage mentions two methods for saving energy: 'small efforts' like turning off lights, and also 'switching to energy-efficient appliances'. The correct answer combines both of these points. The other options suggest methods that are not mentioned in the passage.
本文は、「小さな心がけも大切だが、省エネ性能の高い家電に買い替えることも」節約につながると述べており、両方の方法を挙げている。したがって、小さな工夫と省エネ家電の利用を組み合わせた選択肢が正解である。
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