Which is a likely use for a base?
a. as a vitamin in your food
b. etching metals for printing
c. making foods taste sour
d. making soaps and detergents

the answer is D. Making Soaps and detergents

Soap and Detergent are basic in nature ( Soap contains NaOH which is a strong base, while Detergent contain SO3Na).

Without base, soap will not be able to bind oily mixture on our body. And Basic Detergent is a lot safer than Acidic Detergent