Which group of ingredients is used in preparing Roux ?  a. 1 tablespoon of butter 1 tablespoon of flour to 1 cup of liquid
b. 1 teaspoon of butter 1 teaspoon of flour to 1 litter of liquid
c. 1tablespoon of butter 1 tablespoon of olive oil to 1 cup of liquid
d. 1 teaspoon of olive oil 1 tablespoon of flour to 1 cup of liquid

Roux is made by cooking equal parts flour and fat together until the raw flavor of the flour cooks out and the roux has achieved the desired color. Butter is the most commonly used fat, but you can also make roux with oil, bacon grease, or other rendered fat.

Explanation:

The basic formula for roux is three parts flour to two parts fat (translated, that's 3/4 cup flour combined with 1 stick of butter). You melt the fat in a skillet over medium heat, and then gradually stir in the flour.