For which of the following reaction, `(K_(p))/(K_(c))` ratio is maximum ?
A. `CO(g)+(1)/(2) O_(2)(g) leftrightarrowCO_(2)(g)`
B. `H_(2)(g)+I_(2)(g)leftrightarrow2HI(g)`
C. `PCl_(5)(g)leftrightarrowPCl_(3)(g)+Cl_(2)(g)`
D. `7H_(2)(g)+2NO_(2)(g)leftrightarrow2NH_(2)(g)+4H_(2)O(g)`