Why Must a Customer Go to the Pharmacy to Purchase

Why must a customer go to the pharmacy to purchase pseudoephedrine?

A) Labeling confusion of the product has shown that counseling must be provided by the pharmacist.
B) Too much of the product was shown to cause serious adverse effects and therefore the drug needs to be regulated by pharmacy staff.
C) Placement in the pharmacy out of direct customer access helps to monitor the sale of the drug.
D) Where the product is stocked depends on directions for use found on package labeling.