A recipe asks that the following three ingredients be mixed together: add \(\frac{1}{2}\) of a cup of flour for every \(\frac{1}{2}\) of a teaspoon of baking soda, and \(\frac{1}{4}\) of a teaspoon of salt.

Which of the following rates is a unit rate equivalent to the ratios shown above?

A. 2 teaspoons of salt per 1 cup of flour

B. \(\frac{1}{2}\) teaspoon of salt per 1 teaspoon of baking soda

C. 2 teaspoons of salt per 1 teaspoon of baking soda

D. 1 teaspoon of baking soda per 2 teaspoons of salt