Age-adjusted death rates are used to:

A、Determinetheactualnumberofdeathsthatoccurredinspecificagegroupsinapopulation;
B、Correctdeathratesformissingageinformation;
C、Comparedeathsinpersonsofthesameagegroup;
D、Eliminatetheeffectsofdifferencesintheagedistributionsofpopulationsincomparingdeathrates