Discussion
Baking powder contains :
Answer: A
Baking powder contains sodium bicarbonate, cream of tartar and corn starch.
Sodium bicarbonate is the source of carbon dioxide. Cream of tartar (potassium hydrogen tartrate) is the acid that reacts with it when the powder is moistened, so the dough or batter rises without the bitter, soapy taste of unreacted soda. Corn starch is the filler that keeps the powder dry and stops the two from reacting in the tin.
Sodium bicarbonate alone is baking soda, not baking powder. Calcium bicarbonate is not a leavening agent and exists only in solution, so the two options built on it are wrong.
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