The correct answer is A. Alkaline potassium permanganate.
Bayer’s reagent is a solution of potassium permanganate in an alkaline solution. It is used as a test for reducing sugars, such as glucose. When Bayer’s reagent is added to a
solution of a reducing sugar, the permanganate ion is reduced to manganese dioxide, which precipitates as a brown solid.Acidified potassium permanganate is used as a disinfectant and antiseptic. It is also used to oxidize organic compounds.
Hydrogen peroxide is a bleaching agent and disinfectant. It is also used in rocket fuel and as a propellant in aerosol cans.
Bromine water is a disinfectant and antiseptic. It is also used in the production of bromine compounds.
Alkaline potassium permanganate is the correct answer because it is the only reagent that is used to test for reducing sugars. The other reagents are used for different purposes.