A. thicken the sauce.
Acidic foods, such as tomatoes or wine, are important in a braise to thicken the sauce.
Acidic foods may include tomatoes, wine, corn starch, flour. These are used to thickening of the material they are used in. Here in this example, option A is the correct answer. tomatoes or wine are used in a braise to thicken the sauce.
There are other examples as well. Like corn flour is used to thicken the soups. Flour is used to thicken the pasta sauce. and the examples go on.
