What Differs Between the "Older" Understanding of Maturation and the "Newer

What differs between the "older" understanding of maturation and the "newer" version

A)  We now know that maturation is simply the systematic unfolding of a genetic program. 
B)  We now know that maturation requires the active participation of the infant. 
C)  Recent evidence suggests that maturation is more of a "blank slate" than previously believed. 
D)  Recent evidence suggests that developmental norms need to be revised to accommodate the effects of preschool and day care.