Dan Has History of Panic Attacks in Malls and Grocery

Dan has history of panic attacks in malls and grocery stores.Which additional factor would suggest that Dan has panic disorder with agoraphobia?

A) Dan has hired an assistant to do grocery shopping for him.
B) Dan also has panic attacks when he is in high places.
C) Dan is almost constantly anxious or irritable for no apparent reason.
D) Dan uses stairs to avoid elevators.