Which safety feature is designed to prevent a fire in an aircraft?

The safety feature designed specifically to prevent a fire in an aircraft is related to the design and functionality of the fuel lines. Fuel lines that are designed to break away serve an important purpose in safeguarding against fire hazards. In the event of an impact or an accident, these breakaway fuel lines can disconnect and prevent fuel from leaking into areas where it could ignite, thereby reducing the potential for a fire. This feature is crucial, as it minimizes the risk of fuel spills that could lead to a fire during flight operations or after an emergency landing.

The other options, while they may provide some level of protection or reduction in fire risk, do not specifically address the critical prevention of fire initiation in the same manner. Fireproof engines, while important, do not prevent the occurrence of fire but rather protect the engine itself from the effects of fire. Shielded electrical systems may help mitigate the risk of electrical fires, but they do not prevent fires from other sources such as fuel. Fire retardants in landing gear may assist in containing a fire that has already started but do not actively prevent fires from occurring.