The cause of engine stalling with a flashing antitheft warning light after starting in a vehicle could be a failed ignition key transponder.
The correct answer is: A. ignition key transponder.
When the antitheft warning light is flashing and the engine stalls immediately after starting, it indicates a potential issue with the ignition key transponder. The transponder is part of the vehicle's security system and if it fails, it can prevent the engine from staying running.
To fix this issue, the ignition key transponder may need to be replaced or reprogrammed to communicate properly with the vehicle's security system.
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