$A + B \rightleftharpoons C + D Constant = K_{1}$<br> $E + F \rightleftharpoons G + H Constant = K_{2}$ <br> then $C + D + E + F \Rightarrow$ product. The constant of reaction will be :

Question

( A ) $K_1k_2$
( B ) None of these
( C ) $\frac{K_2}{K_1}$
( D ) $\frac{K_1}{K_2}$