Which Study Supports the Idea That Smell Is a Vehicle

Which study supports the idea that smell is a vehicle for mother-infant recognition and attachment?

A) When breast-feeding mothers significantly changed their diets, their babies no longer preferred the smell of their nursing pads.
B) Breast-fed babies - but not bottle-fed babies - prefer the odor of their mothers' underarms.
C) Before even tasting the bottle, breast-fed babies refused the milk of another mother but accepted formula.
D) Fathers who wore the t-shirts of breast-feeding mothers - but not bottle-feeding mothers - reported less crying when caring for their newborns.