Final answer:
Baking soda, or sodium bicarbonate (NaHCO3), is commonly used for deodorizing and cleaning stains from counters, making 'c) Both a and b' the correct answer.
Step-by-step explanation:
The uses of baking soda include both deodorizing and cleaning stains from counters. Therefore, the correct answer to the question is 'c) Both a and b.' Baking soda, which is a common ingredient in both cooking and household cleaning products, has a chemical name of sodium bicarbonate (NaHCO3). It can be used on its own or combined with other common household ingredients such as vinegar to create effective cleaning solutions. In addition to being an ingredient in toothpaste and antacids, and used in cooking, baking soda is also effective in removing odors and tackling tough stains due to its mild abrasive properties and ability to neutralize odors.