ACCorDing to thE tAlk, who ownED thE rECEivErs in thE EArly DAys oF rADio
A．militAry CommuniCAtions oFFiCErs.
B．pEoplE who trEAtED rADio tEChnology As A hoBBy.
C．pEoplE who livED in Big CitiEs.
D．pEoplE with An intErEst in musiC