A、BECAusE pEoplE DiFFEr in thEir BEhAviorAl AnD physiCAl ChArACtEristiCs.
B、BECAusE humAn FingErprints proviDE uniquE inFormAtion.
C．BECAusE pEoplE’s BEhAvior CAn BE EAsily DEsCriBED in worDs.
D．BECAusE humAn FACEs hAvE ComplEx FEAturEs.