The public is not yet able to purchase hydrogen fuel cell powered cars because engineers have to determine how the cars perform.

The given question is incomplete the options of the compete are:

A. On racecar tracks

B. In real-world conditions

C. In flooded environments

D. On closed courses

Answer: In real world conditions.

Explanation:

Fuel cell vehicles use hydrogen has as a fuel in order to run the car. Unlike the other conventional vehicle that run on fossil fuels and gasoline.

The hydrogen and oxygen combines together in order to power the the motor in the car. The electricity produced by the combination of this runs the car and the waste product is water.

They are also called as electronic cars but the main problem is that it has not been yet tested in the real world. There are many more physiological conditions that differ from place to place in the real world conditions.

Firstly, the cars needs to be tested in the real world and see where there are any advantages and disadvantages over conventional vehicles.

Hence, it is not available to the general public for purchase.