Nora made 3 gallons of lemonade. Which of the following can be used to find the number of pints of lemonade that Nora made?

a. 3 x 2 x 2
b. 3 x 4 x 2
c. 3 x 3 x 2
d. 3 x 4 x 3

Each gallon contains 8 pints, so 3 gallons contain 3 x 8 = 24 pints.

Therefore, the answer is not any of the options given.