The correct answer is D. KOH.
Alkaline cells are a type of primary cell that uses a potassium hydroxide (KOH) electrolyte. The electrolyte is a solution of potassium hydroxide in water. The cathode is made of zinc, and the anode is made of manganese dioxide. The electrolyte allows ions to flow between the cathode and anode, which produces an electric current.
Dilute sulfuric acid (H2SO4) and concentrated sulfuric acid (H2SO4) are both used in lead-acid batteries. Lead-acid batteries are a type of secondary cell that can be recharged. The electrolyte in a lead-acid battery is a solution of sulfuric acid in water. The cathode is made of lead, and the anode is made of lead dioxide. The electrolyte allows ions to flow between the cathode and anode, which produces an electric current.
NaOH is sodium hydroxide, which is a strong base. It is not used as an electrolyte in alkaline cells.