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Passage: Solar panel installations have grown steadily across Pakistan as households and businesses look to escape frequent power outages and rising electricity bills. While the upfront cost remains high for many families, falling panel prices and government incentives have made the technology more accessible than a decade ago. Engineers note that proper maintenance is essential, as dust accumulation can noticeably reduce panel efficiency. Question: What can be inferred about panels that are not properly maintained?
A. They require no maintenance at all
B. They will function better without cleaning
C. Their efficiency is likely to decline over time ✅
D. They become immune to dust
