The process that would be considered a chemical change is C: the burning of wood.
When wood burns, it undergoes a chemical reaction that transforms it into different substances, such as ash, smoke, and gases. This process involves the breaking and forming of chemical bonds, resulting in a change in the chemical composition of the material.
In contrast, cutting a piece of wood (A) or filling a bowl with leaves (B) are physical changes, as they do not alter the chemical composition of the materials involved.