One mole of $$O_{2(g)}$$ and two moles of $$SO_{2(g)}$$ were heated in a closed vessel of one-litre capacity at 1098 K. At equilibrium 1.6 moles of $$SO_{3(g)}$$ were found. The equilibrium constant $$K_c$$ of the reaction would be

A

30

B

40

C

80

D

60