A) flame arrester is the correct answer. A flame arrester is a device used to prevent the passage of flames into enclosed spaces, such as fuel tanks or other areas where flammable vapors may be present. This is an important safety feature to prevent the risk of explosions or fires. The flame arrester works by dissipating the heat of the flame, preventing it from traveling further into the enclosed space. The other options are incorrect because: B) a safety valve is used to release pressure, not specifically to prevent flame passage. C) a flame relief valve is not a standard term, and does not accurately describe the function of a flame arrester. D) a flame stopper is not a standard term in this context.