Read the following passage about driverless cars and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22.

Driverless cars, also known as autonomous vehicles, ___(1)___. These vehicles rely on advanced artificial intelligence and sensor technologies to operate independently, without human intervention. This innovation not only minimizes accidents caused by human error but also optimizes traffic flow, reducing congestion in urban areas.
One significant feature ___(2)___ and urban planners is their potential to communicate with other vehicles and infrastructure. This vehicle-to- everything (V2X) communication allows for a coordinated traffic system, where cars can anticipate and avoid obstacles, adjust speed, and even signal each other to ensure a smooth drive.
Despite these advantages, significant concerns remain about the safety and ethical implications of autonomous vehicles. Machines make complex decisions that raise questions about accountability in case of accidents. ___(3)___.
Driverless cars offer a safer, more efficient transportation experience. Promising transformative benefits to society, ___(4)___. These vehicles still face significant regulatory, technical, and ethical challenges. ___(5)___.