A Mother Has Given Her 6-Year-Old Son Pseudoephedrine (Afrin)nose Drops

A mother has given her 6-year-old son pseudoephedrine (Afrin) nose drops four times a day for 2 weeks.She says at first her son's congestion seemed to get better,but since she stopped giving him the drops,"his cold is worse than ever." Which of the following statements is the nurse's best explanation to the patient's mother?

A) Nose drops lose their effectiveness over time.
B) The nose drops are no match for the virulent cold viruses that are prevalent this season.
C) Her son developed an addiction to the nose drops, which caused excessive drainage when the medication was stopped.
D) Excessive use of nasal decongestants can lead to greater congestion because of a "rebound effect" that occurs when the product is stopped.