What is identified as a major challenge facing solar power?
Result:
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Option 3: "The variability of energy output due to weather conditions"
Explanation: The text explicitly identifies the variability of solar power output as a challenge, stating that it is affected by weather conditions and the time of day, which directly addresses the question.
Option 1: "The high cost of installing solar panels"
Explanation: The text states that advancements in photovoltaic technology have significantly reduced the cost of solar panels, indicating that cost is not a major challenge for solar power.
Option 2: "The difficulty in finding suitable locations for solar farms"
Explanation: The text does not mention any challenges related to finding suitable locations for solar farms, making this option unsupported by the information provided.
Option 4: "The competition with fossil fuel industries"
Explanation: While the text discusses solar power as an alternative to fossil fuels, it does not mention competition with fossil fuel industries as a challenge, thus making this option irrelevant.
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