When Is the Earliest That Classical Conditioning Has Been Demonstrated

Multiple Choice

When is the earliest that classical conditioning has been demonstrated with infants?

A) prenatally
B) in the first few days after birth with a limited number of responses and under optimal conditions
C) not until the end of the first year, because of the immaturity of the infant's information-processing system
D) only after age 2, when brain maturation is nearly complete