The correct option is A Increase in temperature
Temperature - Increase in temperature favours the endothermic reaction and decrease in temperature favours the exothermic reaction for the forward reaction.
Means for exothermic reactions, the value of Kc and Kp decrease with rise in temperature while for endothermic reactions, the value of Kc and Kp increases with rise in temperature. This type of variation in equilibrium constant with temperature was given by Van't Hoff equation as follows
log K2−log K1=△H2.303R[1T1−1T2]
or log K2K1=△H2.303R[1T1−1T2]
Where,
K2= equlibrium constant at temperature T2
K1= equilibrium constant at temperature T1