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