why wAs townE's EArly work with stimulAtED Emission DonE with miCrowAvEs
A．hE wAs not ConCErnED with light AmpliFiCAtion.
B．it wAs EAsiEr to work with longEr wAvElEngths.
C．his pArtnEr sChAwlow hAD AlrEADy BEgun work on thE lAsEr.
D．thE lAsEr hAD AlrEADy BEEn DEvElopED.