A toddler is given the choice between one whole Oreo cookie and one Oreo cookie that has been cut in half. According to Piaget's theory, which one will he likely choose?
A. The whole Oreo cookie, because he believes it is bigger than the cookie that has been cut
B. The half Oreo cookie, because it appears to be more substantial
C. The whole Oreo cookie, because it looks more appealing
D. The half Oreo cookie, because it is easier to hold