thE survEy pArtiCipAnts wErE______.
A．rAnDomly sElECtED unitED stAtEs CitizEns
B．rAnDomly sElECtED nEw york City CitizEns
C．rAnDomly sElECtED mAnhAttAn rEsiDEnts who livE ClosE to thE worlD trADE CEntEr
D．rAnDomly sElECtED AmEriCAn CitizEns who witnEssED thE tErrorist AttACk