A recipe asks that the following three ingredients be mixed together as follows: add 12 of a cup of flour for every 12 of a teaspoon of baking soda, and every 14 of a teaspoon of salt. Which of the following rates is a unit rate equivalent to the ratios shown above?

2 teaspoons of salt per 1 cup of flour

12 teaspoon of salt per 1 teaspoon of baking soda

2 teaspoons of salt per 1 teaspoon of baking soda

1 teaspoon of baking soda per 2 teaspoons of salt