A Child Has Been Taking Methylphenidate 5 Mg at 8

A child has been taking methylphenidate 5 mg at 8 AM,12 PM,and 4 PM for 30 days after a new diagnosis of AD/HD and comes to the clinic for evaluation.The child's mother reports that the child exhibits some nervousness and insomnia but is doing much better in school.The primary care NP should suggest:

A) discontinuing the 4 PM dose.
B) increasing the dose to 10 mg each time.
C) giving 10 mg at 8 AM and 5 mg at noon.
D) changing the dosing to 15 mg twice daily.