If enough heat was REMOVED from B, it would change into A.
An exothermic reaction is a reaction that releases energy, this energy is usually in the form of heat. An endothermic reaction is a reaction that absorbs energy to take place.
To bring molecules together requires the release of energy, that is, an exothermic reaction.
Thus, if heat were removed from B, it would turn into A, with molecules closer together, in the solid state.
Learn more about exothermic reaction in: brainly.com/question/14969584
