At _____, Cary Will Not Search for a Toy That

At _____, Cary will not search for a toy that disappears, but when he is _____, he will look for a toy that has been completely hidden. This searching behavior provides evidence that Cary has acquired understanding of object permanence.

A) 2 months old; 3 months old
B) 3 months old ; 4 months old
C) 3 months old; 6 months old
D) 2 months old; 12 months old