During a Well-Baby Checkup, a Mother Is Concerned Because Her

During a well-baby checkup, a mother is concerned because her 2-month-old infant cannot hold her head up when she is pulled to a sitting position. Which response by the nurse is appropriate?

A) "Head control is usually achieved by 4 months of age."
B) "You shouldn't be trying to pull your baby up like that until she is older."
C) "Head control should be achieved by this time."
D) "This inability indicates possible nerve damage to the neck muscles."