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 times 2 times 2
b. 3 times 4 times 2
c. 3 times 3 times 2
d. 3 times 4 times 3

Each gallon has 8 pints, so 3 gallons have 3 x 8 = 24 pints.

Therefore, the answer is not among the choices provided.