The Plaintiff in a negligence lawsuit suffered a concussion and developed agoraphobia $($the fear of being outdoors$)$ after a large piece of glass fell on his head when he was walking in the downtown area of Calgary. The Defendant argues that the agoraphobia was not a predictable injury. The Defendant's argument is based on which of the essential elements of a negligence lawsuit?

A$)$ causation

B$)$ remoteness of dimage

C$)$ duty of care

D$)$ standard of care