A Patient Reports, "Last Night I Had Several Mixed Drinks

A patient reports, "Last night I had several mixed drinks at a party. When I got home, I had difficulty falling sleep. I made two cups of herbal tea with valerian. This morning, I feel very groggy and have a headache." The nurse should explain which of the following?

A) That valerian should be delayed at least 1 hour after using alcohol to avoid side effects
B) That valerian may increase sedation from other central nervous system depressants
C) That herbal teas often cause nervous system adverse effects such as headaches
D) That these feelings are actually a hangover from excessive alcohol intake