A Person Who Detains Someone for Shoplifting

A person who detains someone for shoplifting

A) may be liable for false imprisonment if she/he holds a suspected shoplifter for an unreasonably long period of time.
B) is always liable for detaining a suspected shoplifter who turns out to be innocent.
C) cannot be held liable for false imprisonment if the suspect had shoplifted store merchandise in the past.
D) is legally required to be a licensed security guard.