Given that there are eight ounces in a cup and four cups in a quart , which quaintity below is equal to 128 ounces
a- 256
b- 64
c- 16
d- 2

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).