With Regard to the Sense of Smell of a Newborn

With regard to the sense of smell of a newborn baby, which of the following statements is the MOST accurate?

A) ​Newborns are basically "nose-deaf," as their sinuses will not be completely clear of fluid from the pregnancy until several weeks after birth.
B) ​Newborns have a keen sense of smell, and can recognize familiar and comforting scents.
C) ​Newborns have a very rudimentary sense of smell suitable only to keep them from eating potentially poisonous substances.
D) ​A newborn's sense of smell is as sharp as that of an adult, but their lack of exposure to different odors is the reason why they don't "use" their smell sense very much.