The correct option is (B). Mothers instinctively know how to cradle their babies in a comforting way.
A mother generally uses her left arm to cradle her baby. This position is such that the baby's face is near the mother's heartbeat which the baby finds comforting. This type of cradling is done around the world. the mothers of traditional societies and modern societies are all using this type of cradling.
It is very natural for a mother to hold her baby in her left arm. By taking this baby near to the heartbeat it makes the baby soothe. It generates a feeling of satisfaction in a baby that they are near to their mother.
