At 525 C, the Equilibrium Partial Pressures for the Substances

At 525 C, the equilibrium partial pressures for the substances in the reaction 2 SO₂ (g) + O₂(g) 2 SO₃(g) were:
P SO = 0.0150 atm, P SO = 0.253 atm, and P O = 0.365 atm. The value of K p for this temperature is:

A) 1.28×10 ^{- 3}
B) 2.16×10 ^{- 2}
C) 46.2
D) 9.63×10 ^{- 3}
E) 779