Using leavening agents, such as baking soda, to baked goods rise during baking is an example of a(n)
a. direct additive
b. indirect additive
c. flavor enhancer
d. functional food

A baking soda, which is used to help baked goods rise during baking is an example of a direct additive. One of the four major purposes of direct additives is to aid in the processing and preparation of food, where baking soda belongs. These leavening is used to preserve the desirable condition of foods.