Entropy is the measure of how disordered a system is. The higher the entropy, the more disordered. Whenever we go from a solid to liquid to gas, that's considered an increase in entropy because the molecules are moving faster and in more random directions. Eliminate B and D
Meanwhile, notice that we see the +34.89 kJ on the left side of the equation / the reactant side of the equation. This means that the reaction is endothermic because there is an input of energy. If the +34.89 kJ was on the right side / the product side, then it would be exothermic.
