Please help with this question

Please help with this question In the reaction, A2(g) + 4 B2(g) 2AB4(g) AH < O the formation ofAB4 is will be favoured at (a) Low temperature, high pressure (b) High temperature, low pressure (c) Low temperature, low pressure (d) High temperature, high pressure

Dear student,

$∆H< 0$ means the reaction is exothermic and to move the reaction in forward direction temperature of reaction should decrease.
As the temperature decreases in the case of exothermic reaction then the reaction will move forward.
if we increase the pressure the equilibrium will shift towards the less number of moles and product side has less number of moles. 
Hence, on decreasing the temperature and increasing the pressure the reaction will move forward towards the product side.
The correct option is  (a) i.e. low temperature and high pressure.

Regards