Which Statement Best Captures the Concept of a Sensitive Period

Which statement best captures the concept of a sensitive period?

A) Children under age five are overly sensitive to criticism by their parents and should not be scolded.
B) A parent should be patient with a child who is learning to read.
C) Events that take place early in life have little effect on development.
D) Some abilities, such as 3-D vision, will not develop if a child does not have proper sensory input early in life.