Build your conversion factors from the information given:
1 cup = 8 oz
1 quart = 4 cup
If you want the equivalence of cups to 128 ounces:
128 ounces * 1 cup / 8 ounces = 128 / 8 cup = 16 cup
So, if the complete question which number of cups is equal to 128 ounces, the answer is the option C. 16
I fyou want the equivalence of quarts to 128 ounces:
128 ounces * 1 cup / 8 ounces * 1 quart / 4 cup = 4 quart (given that this number is not among the choices, this should not be the question).
