In the context of alternative sources of energy, ethanol as a viable bio-fuel can be obtained from  

(a) Potato (b) Rice (c) Sugarcane (d) Wheat

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(c) Sugarcane ethanol is an alcohol-based fuel produced by the fermentation of sugarcane juice and molasses. Because it is a clean, affordable and lowcarbon biofuel, sugarcane ethanol has emerged as a leading renewable fuel for the transportation sector.

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