Two solids A and C shows the following dissociation equilibria : A(s)⇌B(g)+D(g)C(s)⇌E(g)+D(g) The pressure over excess solid A is 40 atm and over excess C is 80 atm. The total pressure of the gaseous mixture over the solid mixture is :
a. 67.0 atm
b. 89.4 atm
c. 134 atm
d. 178.8 atm