The Term Reciprocal Attachment Behavior Refers to Which of the Following

The term reciprocal attachment behavior refers to which of the following?

A) Behavior during the sensitive period when the infant is in the quiet alert stage
B) Positive feedback an infant exhibits toward parents during the attachment process
C) Unidirectional behavior exhibited by the infant, initiated and enhanced by eye contact
D) Behavior by the infant during the sensitive period to elicit feelings of "falling in love" from the parents