There Were Series of Factors Led to the Shooting Down

There were series of factors led to the shooting down Korean Air Lines Flight 007. Which of these might NOT be included in the series of factors?

A) The aircraft deviated from its intended path
B) The flight of American spy aircraft near KAL 007's track
C) The autopilot was in an incorrect mode
D) The aircraft had a single engine failure
E) The crew on board KAL 007 was not monitoring that channel