Question 1070 Deck General

The correct answer is D) All of the above. For combustion to occur inside a piping system, such as a vapor collection header in a marine emission control system, the three elements necessary for combustion must be present: oxygen, fuel, and an ignition source. All three of these elements must be present simultaneously for combustion to take place. Removing any one of these elements would prevent combustion from occurring. The other answer choices are incorrect because they only identify one or two of the necessary elements, rather than all three required for combustion.