What happens next in this paragraph?

How to operate an oxy gasoline cutting torch system
Fill in the gasoline tank with ordinary gasoline.
Select a torch and cutting nozzle according to your cutting task.
Fasten the nozzle with a pair of wrenches.
pick from the following.
[A]. Immediately remove the torch from the tank and position it so the back of the leak nozzle must be facing the metal pipe. Test the gas and wait for it to drain out of the tank..
[B]. Power-up your farming tractor or any tractor using a special battery powered configuration. Shut off your fuel tank by turning off the power valve on your tractor..
[C]. Insert the cutting tool into the cut opening where the gasoline boils. Try to angle the nozzle slightly to find the gas..
[D]. Connect the fuel hose (gasoline hose) properly with a pair of wrenches. Connect the oxygen hose properly with a pair of wrenches..
[D].