From Bowlby's Work on Attachment,how Would a 9-Month-Old Infant Behave

From Bowlby's work on attachment,how would a 9-month-old infant behave if separated from its mother?

A) He would exhibit little or no initial reaction.
B) He would cry when his mother leaves.
C) He would notice her impending departure,signaling a better understanding of his surrounding world.
D) He would accept his mother's temporary absence.