A "Back-Door" Cold Front Best Describes Which of the Following

Multiple Choice

A "back-door" cold front best describes which of the following situations?

A) A cold front moving into Washington state from the Pacific Ocean
B) A cold front moving into the desert southwest from Northern Mexico
C) A cold front that moves into New England from the Atlantic Ocean
D) A cold front that moves in a clockwise direction around a low-pressure center
E) A cold front that originated over the Pacific Ocean.