What does the phrase "en route" mean

A．Some of them said that the missile couldn't reach the distance to hit airliner.
B．Some of them confirmed that the missile was really fired from Ukraine' s Crimea region before the plane exploded.
C．Some of them argued about whether the plane had strayed from its flight.
D．All of the above.

A．Because Russia did something wrong and he was afraid that someone would wreak it.
B．Because the "911 event" had just passed, he was afraid that the terrorist would do something against Russia.
C．Because he thought everything evil could be connected with terrorist.
D．Because he was a sensitive man.