The main oxides formed on combustion of Li, Na and K in excess of air are, respectively :

Question

( A ) $Li_2O, Na_2O_2$ and $KO_2$
( B ) $Li_2O, Na_2O$ and $KO_2$
( C ) $Li_2O_2 , Na_2O_2 $ and $KO_2$
( D ) $LiO_2, Na_2O_2 $ and $K_2O$