In which of the following the oxidation number of oxygen has been arrangd in increasing order :-
A. `OF_(2) lt KO_(2) lt BaO_(2) lt O_(3)`
B. `BaO_(2) lt KO_(2) lt O_(3) lt OF_(2)`
C. `BaO_(2) lt O_(3) lt OF_(2) lt KO_(2)`
D. `KO_(2) lt OF_(2) lt O_(3) lt BaO_(2)`