The correct answer is C) 456 fl oz
There are 4 quarts in 1 gallon. This means that 3 gallons = 3*4 = 12 quarts.
Adding this to the 2 quarts in the problem, we have 12+2=14 quarts.
There are 2 pints in every quart. This means that 14 quarts = 14*2 = 28 pints.
There are 2 cups in every pint. This means that 28 pints = 28*2 = 56 cups.
Adding this to the 1 cup in the problem, we have 56+1=57 cups.
Each cup is 8 fl oz; this gives us 57*8 = 456 fl oz.