The correct answer is A. wood charcoal.
Wood charcoal is a type of activated carbon that is made by heating wood in the absence of oxygen. This process removes all of the water and volatile compounds from the wood, leaving behind a porous, black solid. Wood charcoal is used in a variety of applications, including decolorizing brown sugar solution.
Coconut charcoal is another type of activated carbon that is made by heating coconut shells in the absence of oxygen. It is similar to wood charcoal in terms of its properties and applications.
Animal charcoal is a type of activated carbon that is made by heating animal bones in the absence of oxygen. It is less commonly used than wood or coconut charcoal, but it has some unique properties that make it suitable for certain applications.
Sugar charcoal is a type of activated carbon that is made by heating sugar in the absence of oxygen. It is not commonly used, and it has no advantages over other types of activated carbon.
In conclusion, the correct answer is A. wood charcoal.