Answer: (1)

Why? A potential energy diagram is a measure of the potential energy of reactants and products relative to each other. The potential energy of reactants and products will indicate whether energy has been consumed (endothermic) during the reaction or released as a result of the reaction (exothermic). The diagram also indicates the activation energy or the energy that must be overcome before a reaction will proceed, regardless of the reaction being endothermic or exothermic.

Answering the Question:

The question shows a potential energy diagram of the reactants A and D forming product G. It also indicates that the reaction if endothermic, as the energy state of the product is higher than that of the reactants. This indicates that not only was the activation energy needed, but also that energy was supplied to the system in order for the reaction to continue. It is, therefore, important to know which of the answers would result in a product that would have required energy to be formed.