What occurs during auto-catalysis?

During auto-catalysis, a product of a chemical reaction acts as a catalyst for that same reaction, thereby increasing the rate at which the reaction occurs. This phenomenon is often observed in reactions where one of the products can facilitate or enhance the conversion of reactants into more products. As the reaction progresses and the concentration of the product increases, the catalytic effect leads to an acceleration of the reaction rate, typically resulting in a feedback loop where the production of the product further promotes its own formation.

In the context of the choices available, this understanding aligns perfectly with the assertion that a product of a reaction increases the rate of the reaction. This characteristic distinguishes auto-catalysis from other reaction dynamics where products may have little to no effect or even inhibit the reaction. Such behavior showcases the unique role of certain products in promoting their synthesis through catalytic action.