Which of These Can Be Classified as a Good Example

Which of these can be classified as a good example of the cultural practice of co-sleeping?

A) A mother accidentally falls asleep while rocking her newborn daughter.
B) During a lightning storm, a child sneaks into the parental bed and falls asleep.
C) Having children sleep in a room next-door to the parental sleeping room.
D) When grandpa falls asleep on the couch while holding the sleeping baby.
E) none of the answers is correct