pEoplE in A lArgE ArEA mAy possEss thE sAmE DnA thrEAD BECAusE ______ .
A．DnA is ChArACtEristiC oF A rEgion
B．thEy ArE oF Common AnCEstry
C．DnA hAs thE ABility to iDEntiFy inDiviDuAls
D．thEir uniquE iDEntiFiCAtion CAn BE proviDED viA DnA