The word "ditched" ( Line 1, Para. 4) could best be replaced by ______.

A．impact on our thinking about good and evil
B．crimes in World War Ⅱ
C．racial convictions
D．importance in world history

A．civilized man will occasionally indulge in savage killing
B．a man who knows good is not likely to become evil
C．man is both good and evil by nature
D．man can choose to be good or evil