Question

what are the four elements of combustion? (choose 4)
fuel
water
oil
air
compression
exhaust
spark/ignition
intake

Explanation:

Combustion requires fuel to burn, air (oxygen) for oxidation, compression to increase temperature and pressure in some cases, and a spark/ignition source to start the reaction. Water and exhaust are not elements of combustion itself. Oil is a type of fuel. Intake is related to the process in engines but not a fundamental element of combustion.

Answer:

Fuel, Air, Compression, Spark/Ignition