'Co-Sleeping' Is

'Co-sleeping' is:

A) accidentally falling asleep while sitting on the couch holding an infant.
B) a purposeful arrangement for sleeping in close proximity with others (e.g., in the same room or in the same bed with one's infant) .
C) never a good idea, evolutionarily speaking, due to the threat of infant suffocation.
D) bed-sharing of any kind.
E) never polyphasic.