The Fact That Human Babies Who Are Massaged Show Faster

The fact that human babies who are massaged show faster neurological development:

A) illustrates the difference between a critical period and a sensitive period.
B) presents yet another example of how Piaget underestimated the abilities of young children.
C) provides an example that is consistent with Vygotsky's zone of proximal development.
D) indicates that human development can be significantly affected by the environment.