I need help with an AP Chem problem. Thanks in advance!

Question

Which of the following reactions would proceed the furthest to completion?  

1. A (g) + B (g) ↔ C (g) Kp = 1.2 x 103
2. AB2 (g) ↔ A (g) + 2B (g) Kp = 0.785
3. A (g) ↔ B (g) Kp = 3.45 x 10-4
4. A (g) + B (g) ↔ C (g) + D (g) Kp = 12

Answer 1

The value of Kp (equilibrium constant) gives an indication of how far the reaction lies to the right at equilibrium. The greater the value, the further to the right it lies.

Kp = 1.2x10³ is the greatest value and this reaction would proceed the furthest to completion