Your Sister Is Very Concerned About Your Toddler Nephew

Your sister is very concerned about your toddler nephew.When they were at the pediatrician's office,the doctor measured your nephew's head circumference and his head is not growing as quickly as his body.What should you tell your sister?

A) She should find a good surgeon.The fontanels must have closed too soon.
B) You suggest that your nephew must have microcephaly.
C) This is to be expected,as the body grows faster than the head during toddlerhood.
D) You should remind her that she also has a very small head.