why DoEs thE Author sAy thAt thE protECtion oF EnDAngErED spECiEs is A highly ControvErsiAl issuE
A．BECAusE pEoplE CAn't AgrEE As to whAt spECiEs to protECt.
B．BECAusE it is DiFFiCult to FinD An EFFECtivE wAy to protECt suCh spECiEs.
C．BECAusE it AFFECts thE intErEsts oF CErtAin groups oF pEoplE.
D．BECAusE it is A mAjor proBlEm involving A sEriEs oF lEgAl proCEDurEs.