For which of the following reactions will a decrease in pressure shift the equilibrium to the left? A). 2A2 (g) + B2 (g) --> 2A2B (g)

B). 2AB (g) --> A2 (g)+ B2 (g)

C). 2A2F3 (g) --> 4A (g) + 3F2 (g)

D). 2B (s) + 2HA (aq) --> 2BA (aq) + H2 (g)