________ is the ability to form symbols that stand for objects or events in the world

As children become old enough to look after themselves, those who __________ appear responsible and well-adjusted

A) have a history of authoritative child rearing B) are not required to perform household tasks C) are left to their own devices D) are given the responsibility of caring for younger siblings

Lewis and Brooks-Gunn (1979) put a red spot on the noses of children who were 9, 12, and 18 months old. The children then viewed themselves in mirrors. At what age did the children rub their noses, recognizing the image was their own?

a. 9 months b. 12 months c. 18 months d. none of them did