For the following three reactions, equilibrium constants are given:(a) $\text{CO}(g)+{\text{H}}_2\text{O}(g)\rightleftharpoons {\text{CO}}_2(g)+{\text{H}}_2(g);K_1$ (b) ${\text{CH}}_4(g)+{\text{H}}_2\text{O}(g)\rightleftharpoons \text{CO}(g)+3{\text{H}}_2(g);K_2$ (c) ${\text{CH}}_4(g)+2{\text{H}}_2\text{O}(g)\rightleftharpoons {\text{CO}}_2(g)+4{\text{H}}_2(g);K_3$ Which of the following relations is correct?

1. A
   $K_1/K_2=K_3$
2. B
   $K_2{K}_3=K_1$
3. C
   $K_3=K_1{K}_2$
4. D
   $K_3\cdot K_2^3=K_1^2$