Two non-reactive monoatomic ideal gases have their atomic masses in the ratio $2 : 3$. The ratio of their partial pressures, when enclosed in a vessel kept at a constant temperature, is $4 : 3$. The ratio of their densities is :-
  • A$1 : 4$
  • B$1 : 2$
  • C$6 : 9$
  • D$8 : 9$
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