The Warren Commission Investigation of the Assassination of President John

The Warren Commission investigation of the assassination of President John Kennedy concluded

A) None of these answers is correct.
B) Jack Ruby killed Oswald on the orders of an unknown third party.
C) both that Lee Harvey Oswald was the lone assassin of Kennedy, and that Jack Ruby killed Oswald on the orders of an unknown third party.
D) An unknown second gunman shot from a "grassy knoll" behind the motorcade.
E) Lee Harvey Oswald was the lone assassin of Kennedy.