There are really only two choices there ... hot air rising is one PART of a convection current, and convection current happens because of physical properties.
Fuel can burn in a furnace because of its chemical properties. (B)
When you turn up the thermostat, fuel can burn in the furnace this is considered a chemical property of matter.
The burning of fuel in a furnace is a chemical reaction. Burning or combustion is a chemical reaction in which a substance combines with oxygen to produce heat and light.
The burning of fuel in the furnace leads to the production of new substances other than the starting substances. Therefore, burning is a chemical reaction.
Summarily, when you turn up the thermostat, fuel can burn in the furnace this is considered a chemical property of matter.
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