The Parents of a 15-Month-Old Child Express Concern to the Nurse

The parents of a 15-month-old child express concern to the nurse about their child's thumb-sucking habit.Which of these explanations related to the child's age and developmental level would be most appropriate for the nurse to give the parents?

A) Thumb sucking at this age indicates a developmental delay and should be further assessed.
B) Sucking achieves a pleasing result for infants, and generalizing that action by thumb sucking is normal.
C) Thumb sucking at this age demonstrates a transition away from egocentric thinking.
D) At this age, thumb sucking will enhance language development.