Given that there are eight ounces in a cup and four cups in a quart, which quantity below is equal to 128 ounces

256 ounces 64 ounces 18 cups 4 quarts

since the first 2 choices are also ounces, they aren't correct

so now youhave either 18 cups or 4 quarts

8 ounces to a cup so 8*18 = 144 ounces

8x4 = 32 * 4 = 128 ounces

so the answer is 4 quarts