Equilibria — practice question

For the equilibrium $2\text{SO}_2(g) + \text{O}_2(g) \rightleftharpoons 2\text{SO}_3(g)$, which factor will alter the value of $K_p$?

• Aadding a catalyst
• Badding more $\text{O}_2$
• Cincreasing the pressure
• Dincreasing the temperature