The correct answer is A. Wood charcoal.
Wood charcoal is a type of activated carbon that is made by heating wood to a high temperature in the absence of oxygen. This process removes all of the water and volatile compounds from the wood, leaving behind a porous, solid material. Wood charcoal is used for a variety of purposes, including decolorizing brown sugar solution.
Coconut charcoal is another type of activated carbon that is made from coconut shells. It is similar to wood charcoal in terms of its properties and uses. However, coconut charcoal is often considered to be superior to wood charcoal because it is more pure and has a higher surface area.
Animal charcoal is a type of activated carbon that is made from animal bones. It is less common than wood charcoal and coconut charcoal, but it is still used for a variety of purposes, including decolorizing brown sugar solution.
Sugar charcoal is a type of activated carbon that is made from sugar. It is the least common type of activated carbon, and it is not typically used for decolorizing brown sugar solution.
Wood charcoal is the best choice for decolorizing brown sugar solution because it is the most effective type of activated carbon. It is also the most affordable option.