A Couple of Months Ago, Your Friend's Baby Was Sleeping

A couple of months ago, your friend's baby was sleeping through the night.Now she is waking up quite a bit at night.This is not only frustrating but concerning.She knew that you took a developmental course and wants to know if you have any ideas.What do you tell her?

A) Her baby is probably teething.
B) It sounds like night terrors.
C) She might need to eat more frequently due to a growth spurt.
D) Sometimes there are just no reasons.