Which of the following illustrates conservation? A. Joseph saves his energy by brushing his teeth…

Which of the following illustrates conservation?
A. Joseph saves his energy by brushing his teeth in the shower
B. Rebecca recycles her glass bottles but not her cell phone batteries
C. Scott knows that one piece of pizza cut into two slices is the same amount as cutting the same piece of pizza into three slices
D. Deidre believes that five pennies have more value than two nickels