whilE thE CAusEs oF thE CrEtACEous-tErtiAry ExtinCtion hAvE rECEivED thE most AttEntion, AlvArEz's pApEr points out work on thE othEr mAjor mAss ExtinCtions thAt mAy Also BE ------- For thE trAgEDy. A.AnswErABlE B.inDEFEnsiBlE C.pitiABlE D.rEprEhEnsiBlE E.(E) AvoiDABlE