ACCorDing to FiElDs, All oF thE Following ArE thE ADvAntAgEs oF his tEChniquE ExCEpt thAt ______.
A．it is EnvironmEntAlly FriEnDly
B．it is sAFE to thE pEoplE's hEAlth
C．it is morE EFFECtivE thAn pEstiCiDEs AgAinst somE insECts
D．it is ChEApEr thAn pEstiCiDEs