Consider the Reaction A(g)+ B(g) C(g)+ D(g)

Consider the reaction A(g) + B(g) C(g) + D(g) .You have the gases A,B,C,and D at equilibrium.Upon adding gas A,the value of K:

A) increases,because by adding A more products are made,increasing the product to reactant ratio
B) decreases,because A is a reactant so the product to reactant ratio decreases
C) does not change,because A does not figure into the product to reactant ratio
D) does not change,as long as the temperature is constant
E) depends on whether the reaction is endothermic or exothermic