Answer:
A. It requires mass production of crops.
Explanation:
Of all the options the only one that represents a disadvantage is that biopower requires mass production of crops because it could cause loss of biodiversity, degradation of soil quality, soil erosion, food toxicity (due to pesticide residues) and pollution ( use of fossil fuels for agrichemical manufacture, farm machinery and long-distance distribution).
The fact that it is readily available in most places, produces net-zero emissions and is biodegradable are all advantages.
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