JohnisreadinganinterestingbookonevolutiontheorywhichwaswrittenbyCharlesDarwin，whowasaBritishnaturalistwhodevelopedatheoryofevolutionbasedonnaturalselection.Whatdesignfeatureoflanguageisreflectedintheexample？()
A.Creativity
B.Arbitrariness
C.Displacement
D.Duality
正确答案是A