Which One of the Following Best Illustrates Social-Emotional Development as a Developmental

Which one of the following best illustrates social-emotional development as a developmental domain?

A) Pamela has decided to get a fashionable new haircut.
B) Annika cries in pain when she steps on a sharp pebble.
C) Carlos is learning how to play cooperatively with his preschool classmates.
D) Thomas used to think that the earth was flat, but now he knows that it's round.