Cocoa powder is one of the components of cocoa beans that remains after the cocoa butter is extracted from the chocolate liquor. This remaining solid is processed and convert into unsweetened cocoa powder. Natural and dutch processed cocoa powder are two types of unsweetened cocoa powder.
When natural cocoa powder is used with alkali or baking soda it cause the batter to rise when the cookies, brownies, etc are placed in the oven. So cocoa powder is most often used in the baking process. The dutch processed cocoa is neutralized first by treating with alkali. So the correct answer is c.
