The correct option is A Increasing the volume will produce more AB
Change in gaseous moles for this reaction:
Δng=1−2=−1
When pressure is increased , ngV↑ , the reaction goes where ng decreases. For Δng<0, it decreases in the forward direction.
So when Δng<0, and P↑, the reaction goes in forward direction.
When volume is increased , ngV↓ , the reaction goes where ng increases. For Δng<0, it increases in the backward direction.
So when Δng<0, and V↑, the reaction goes in backward direction.
Hence we can see that from given options, (a) is correct.