Ingredient Quantities in Baking Cookies

Maria is baking cookies and needs to evenly distribute her ingredients. She has the following quantities of ingredients: 3/4 cup of sugar, 2/3 cup of butter, and 5/6 cup of flour. To prepare the dough, she plans to use the minimum quantity of one ingredient, multiplied by 2 to create her mixture. Which ingredient will she use the least of when she doubles it for the dough?