What is needed for propane to burn effectively?

For propane to burn effectively, it requires an ignition source. This is essential because propane is a flammable gas that needs a specific condition to ignite. The combustion process involves the mixing of propane with oxygen in the air, and the ignition source provides the necessary heat to initiate the chemical reaction. This could come from a match, a lighter, or any other means that generates enough heat to ignite the propane-air mixture.

While other options present unsafe or misleading concepts regarding the combustion of propane, they do not meet the criteria for effective burning. An ignition source is fundamental to start the process, which is why it is the correct answer. Without this ignition source, the propane cannot combust, regardless of other factors such as pressure or gas characteristics.