The statement that suggests a cause of the conflict between Napoleon and Snowball is D. Napoleon wants to control all aspects of the farm and sees Snowball's idea as a threat.
From the passage, it can be deduced that Snowball's idea of building a windmill was far-sighted and this could reduce hard labor in the future. Ob the other hand, Napoleon wanted to keep food to prevent scarcity.
Due to this reason, Napoleon wants to control all aspects of the farm and sees Snowball's idea as a threat. This caused the conflict between them.
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