Ifthefunctionoflanguageislimitedtocommunication,thenanimals'callscanalsobecalledlanguage,butactuallytheyarenot.Comparedwithtrafficlightsystem,languageisfarmorecomplicatedandresourceful.Thisreflectsthatlanguagehasthefeatureof__________.
A.arbitrariness
B.finiteness
C.creativity
D.displacement
正确答案是C