Which of the following does NOT support combustion?

Moisture does not support combustion because it is typically associated with the presence of water, which acts to cool and suppress fires. When combined with combustible materials, moisture reduces the temperature and inhibits the chemical reactions necessary for combustion to occur. In contrast, fuel, oxidizing agents (such as oxygen), and heat are all essential components of the fire triangle, which highlights the conditions required for a fire to ignite and sustain itself. Without these three elements, combustion cannot take place. Thus, moisture stands apart as it counteracts the conditions necessary for igniting and maintaining a fire.