I don't understand what this means?

The yellow sand-filled Fitch Barrier is a crash cushion commonly seen in front of bridge abutments and other potential roadside hazards. The barrel-shaped design is considered one of the more cost-effective crash attenuators on the market today. Modules are designed to handle impacts from compact cars to SUVs without ramping, minimizing the likelihood of injuries to passengers and reducing property damage, while meeting all the requirements of the NCHRP 350 standard.

"the occupants of which car".....means there are 2 or more cars.

Your choice of answers would probably be:

1) the occupants of car A

2) the occupants of car B

So you would have to choose the car that you think was damaged the most.

Fitch barriers are those big yellow barrels filled with sand.on the freeways. a car hitting the concrete divider without the barriers would be more seriously hurt

The way you wrote it, neither.

Which car, not which occupants.

I have a feeling there was more to this question.