A 5-Week-Old Infant Tightly Grasps a Little Toy Placed in His

A 5-week-old infant tightly grasps a little toy placed in his hands. The mother was impressed with this ability. The nurse on duty should explain that this is:

A) a behavior that is usually observed in an older infant.
B) a palmar grasp reflex that is expected at this age group.
C) an unusual behavior that needs further evaluation.
D) a pincer grasp reflex which will disappear in about 3-4 months of life.