Final answer:
The driver who crossed the center line is at fault in a car accident where they pass another car and strike a car coming head-on. Not having headlights on may be a contributing factor, but it does not absolve the driver from responsibility.
Step-by-step explanation:
In a car accident where a car passes another car by crossing left of center and strikes a car coming head-on, the fault is typically assigned to the driver who crossed the center line. Crossing the center line is a violation of traffic laws and is considered negligent driving. The fact that the car coming head-on did not have headlights on may be a contributing factor, but it does not absolve the driver who crossed the center line from responsibility.
It's important to follow traffic laws and drive safely to prevent accidents and ensure the safety of all individuals on the road.