Most children growing up under adversity become well-adjusted adults. This best illustrates A. conservation.

B. egocentrism.

C. object permanence.

D. resilience.

D

Explanation:

Resilience because they are capable of retaining "normal" behavior after experiencing trauma or long-term duress. (Ie: It is estimated that 30% of abused children will later become the abusers but the other 70% who do not inherit that behavior are resilient)