Which of the following would indicate that a child understood conservation?

a. She would continue to seek a toy hidden under a blanket.

b. She would “hide” in a game of hide-and-seek by covering her eyes with her hands.

c. She would believe that a clay snake would have the same amount of clay as the clay ball that was used to make it.

d. She would recognize that 7 + 3 involves the same mathematical relationship as 10 – 7.

e. She would be able to comprehend the logic of if-then statements.