If a reaction solution at equilibrium is cooled down and the color shift moves toward the reactants, is the reaction endothermic or exothermic?

Endothermic reaction.

Explanation:

Reactants + heat ↔ Products.

As the temperature cooled, it is like that decreasing the concentration of reactants side, that shifts the reaction towards the lift side (reactants side) to attain the equilibrium again.

So, the reaction is an endothermic reaction.

3

explanation:

i believe the answer is a.