Question

which limitation of fuel cells is the most likely reason why people are concerned about using fuel cells in cars?
○ hydrogen gas is volatile
○ water contains a lot of hydrogen atoms
○ fuel cell cars cannot drive at extreme speeds
○ fuel cell cars are very quiet

Explanation:

• For option A: Hydrogen gas being volatile (easily vaporized, flammable) poses safety risks (e.g., explosion/fire hazards) in car use, a major concern.
• For option B: Water’s hydrogen content is irrelevant to fuel cell car concerns (fuel cells use hydrogen gas, not water’s H - atoms for operation).
• For option C: Extreme speed limits are not a primary concern for most users (cars are rarely driven at extreme speeds, and this is not a key fuel - cell - specific limitation).
• For option D: Quiet operation is an advantage, not a limitation or concern.

Answer:

A. Hydrogen gas is volatile