A) merely C) even
B) at least D) just

A．People who believe that war is instinctive with men draw evidences from______.
B．biology
C．scientific experiments
D．philosophy
E．human history

A．There are different factors which may lead to war.
B．War has been rooted in and will develop with human history.
C．Both men and ants maintain complex social organizations.
D．Only men and ants have developed and practiced the art of war.