According to the textbook, research on the development of the self-concept using the "red dye" test (placing a red dot on the forehead of the child and then showing the child his or her reflection

in the mirror and seeing whether the child touches the red dot on the "baby in the mirror" or his or her own head) indicates that the self-concept in human infants develops at, on average, age
a. 6–8 months.
b. 12–14 months.
c. 18–24 months.
d. 2–3 years.

Answer: C