Answer:
a. type of fuel-injection system.
Explanation:
An engine described as having an efi fuel system uses an electronic fuel injection system. It is a form of fuel-injection system that is developed to improve on the limitations of its fizzled-out counterpart - carburetor.
EFI systems have various components making it better than the carburetor.
Some of which are;
Engine control unit, fuel tank and injector, throttle sensor and a fuel delivery system.
