Nori's Mother Makes a Loud Noise

Nori's mother makes a loud noise. Nori, age 2 months, then throws her arms outward while arching her back and bringing her hands back together as if grasping something. Nori's mother should do which of the following?

A) She should see the pediatrician to find out why Nori startles so easily.
B) She should not worry because this reflexive reaction is typical for a child Nori's age.
C) She should be very concerned about Nori's neurological health because this reflex should have disappeared by the age of 2 months.
D) She should hope Nori will always respond this way because it is a consistent sign of normal neurological development.