Which of the following may cause receive interference to an HF transceiver installed in a vehicle?
Why Modern vehicles are full of switching electronics, and any of them can radiate broadband hash into an HF receiver. The alternator and its voltage regulator produce a whine that rises and falls with engine speed, the electric fuel pump and injector drivers pulse current at audio rates, and the engine, transmission and body control computers run fast clocks and switch loads. Because all three are real, documented sources of vehicle-generated RFI, the inclusive answer is correct.
Watch out Picking just one source, such as the charging system, is tempting because alternator whine is the most famous automotive noise, but it is only one of several culprits in a modern car.
Charge it, fuel it, compute it: in a car, everything electrical makes HF noise, so pick 'all of these'.