The reaction shown below is at equilibrium if we raise the temperature  of the reaction system what would be the effect ?

hcbiochem2021-04-07T21:49:39Z

Since heat is a "reactant" (the reaction is endothermic). If you think about Le Chatelier's Principle, increasing the temperature is like adding a reactant, and the equilibrium will shift to the right, toward the product side. Increasing temperature changes the value of K. 

So, the third choice is the correct one.

Roger the Mole2021-04-07T21:43:43Z

The third choice is correct.