The secret should be told to someone because the old pirate died and the mystery of the large treasure was buried with him.

A) The secret should be told to someone
B) Incredibly, the well kept secret might be telling to someone
C) The secret should have been told to someone
D) Being told by someone of the secret
E) It is a sad fact that someone should of being told the secret

The OA is C.

Where is the mistake in option A? I need an expert here please.