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【单选题】
Friedrich Engels declared that the potato was the equal of iron for its ' historically revolutionary role', then according to the text, what does this 'historically revolutionary role' refer to?A.
Its high volume of production, and consequently lower price, greatly supported the workers in the factories then.
B.
It liberated workers from the land, thus providing labour force for the industry.
C.
It changed the agriculture structure of England, which ultimately resulted in a shift from an agricultural country to an industrial one.
D.
It can provide more calories, thus saving land for cotton growing, and consequently boosting the textile industry.
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