Consider this reaction at equilibrium.

     \({{\text{H}}_2}{\text{S(aq)}} + {\text{Z}}{{\text{n}}^{2 + }}{\text{(aq)}} \rightleftharpoons {\text{ZnS(s)}} + {\text{2}}{{\text{H}}^ + }{\text{(aq)}}\)     \(\Delta H < 0\)

Which change shifts the equilibrium position to the right?

A.     Adding sodium hydroxide

B.     Decreasing pressure

C.     Adding a catalyst

D.     Increasing temperature

A