What Have Studies of Romanian Orphans Told Us About the Importance

What have studies of Romanian orphans told us about the importance of early experience for brain development?

A) The earlier an experience occurs, the more influential it is for later development.
B) The later in development an experience occurs, the more important are its effects.
C) The experiences of all periods of development contribute equally to developmental outcome.
D) During phases of rapid brain growth, brain structures are particularly sensitive to infants' experiences.