In which casualty case is it UNNECESSARY to notify the local Coast Guard Marine Safety Office?

A
A seaman is injured and in the hospital for four days.
B
Nylon mooring line parts while the vessel is tied up and kills a harbor worker who was on the pier.
C
Your vessel is backing from a dock and runs aground, but is pulled off by tugs in 30 minutes.
D
Your vessel strikes a pier and does $1,500 damage to the pier but none to the vessel.
E