How Do Children Develop Special Attachments to Their Mothers,according to John

How do children develop special attachments to their mothers,according to John Bowlby?

A) The mother provides innate contact comfort to the infant.
B) The infant is biologically programmed to emit behavior that triggers a protective response from adult females.
C) The mother becomes a conditioned reinforcer because she is associated with the reinforcing act of being fed.
D) Maternal attachment behavior is the result of reproductive fitness.