Mr. P. comes in asking for some assistance in getting relief from his nasal congestion. He reports that he takes Zyrtec daily and uses his Afrin nasal spray two to three times a day. However, he just can't seem to get any relief. You explain which of the following to Mr. P.?

A) He will need to increase his Zyrtec to twice daily dosing.
B) His nasal congestion may be a rebound phenomenon from his habitual Afrin use.
C) He will need to change from Zyrtec to Allegra.
D) His Afrin nasal spray is not potent enough, and he needs to get Neo-Synephrine spray.