Although Aggressiveness Has Evolved and Has Been Maintained Because It

Although aggressiveness has evolved and has been maintained because it has survival value,researchers underscore the point that _______________ also seem to have developed strong inhibitory mechanisms that enable them to suppress aggression when it is in their best interest to do so.

A) nearly all organisms
B) nearly all vertebrates
C) cognitively developed species
D) most primates
E) only a few species