At 900 K, the Equilibrium Constant (K_p) for the Following

At 900 K, the equilibrium constant (K_p) for the following reaction is 0.345. 2SO₂ + O₂ (g) -2SO₃ (g)
At equilibrium, the partial pressure of SO₂ is 35.0 atm and that of O₂ is 15.9 atm. The partial pressure of SO₃ is _ atm.

A) 6.20 × 10^{- 4}
B) 192
C) 40.2
D) 82.0
E) 4.21 × 10^{- 3}