Which of the following is an example of a diffusion flame?

A diffusion flame is characterized by a flame that forms where fuel and oxidizer mix in the air before combustion occurs, leading to a more stable and continuous burning process. A candle serves as an example of a diffusion flame because the wick draws up wax, which becomes vaporized as it heats. This vaporized fuel then mixes with the surrounding air and ignites at the flame's tip, creating a steady flame that is sustained by the continuous supply of fuel and oxygen.

In contrast, an oil lamp creates a flame through capillary action where the oil is drawn up to the wick, but it requires specific conditions to maintain its flame stability and doesn't consistently mix air and fuel in the same way as a candle. A match generates a flame primarily through rapid combustion of chemicals on its head without the sustained diffusion of gaseous fuel. A gas stove flame involves a premixed flame type where natural gas mixes with air before ignition, which differs from the diffusion process that occurs in a candle. Thus, the candle is the most accurate representation of a diffusion flame among the provided options.