What Research Could a Developmental Psychologist Rely on When Explaining

What research could a developmental psychologist rely on when explaining to parents infant interaction and adult attention to children's faces?

A) Attachment represents a reaction to people around the infant.
B) Infants' sociability is expressed in primitive ways during the first 6 months.
C) Behaviors and cognitive imitation are essential for the positive recognition of interactions.
D) Brain scanning techniques have found that the facial features of infants activate a specialized structure in the brain called the "fusiform gyrus" within an interaction.