A. heat engine
B. wind
C. electricity
D. animal
Correct Answer: Option B
B. wind
Explanation
Choice B is the most unreliable source of farm power and choice B is wind.
A. heat engine
B. wind
C. electricity
D. animal
Correct Answer: Option B
B. wind
Explanation
Choice B is the most unreliable source of farm power and choice B is wind.
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