Suppose you are writing an essay on gun control. Which TWO of the following sources might be the most relevant papers to your research?

A、Gunsdon’tkillpeople,Peoplekillpeople;
B、DoesIllegalImmigrationDisadvantageAmericanWorkers?;
C、DoMoreGunsMeanMoreDeathsandInjuries?;
D、LeadingCausesofDeathinAmerica