Answer:
I think that the answer is D, but I'm not entirely sure.
Step-by-step explanation:
My thinking is that the bond between mother and child is really strong. Attachment, in my mind, would be that relationship. When I think attachment, I tend to think of emotional attachment. Also, if something is physically attached, wouldn't it be an inanimate object?
That was really long winded, sorry. But I hope that helps you!