Question

many factors would bring advantages when using fuel cells in cars, but which factor presents a drawback?
○ fuel consumption
○ hydrogen storage
○ greenhouse gas emissions
○ reliance on petroleum products

Explanation:

1. Analyze each option:

• Fuel consumption: Fuel cells in cars typically have good fuel efficiency, so this is an advantage, not a drawback.
• Hydrogen storage: Storing hydrogen for fuel cells in cars is challenging due to its low density, requiring special storage methods (like high - pressure tanks or cryogenic storage), which is a drawback.
• Greenhouse gas emissions: Fuel cells (especially hydrogen - based ones) produce little to no greenhouse gas emissions during operation, so this is an advantage.
• Reliance on petroleum products: Fuel cells (e.g., hydrogen fuel cells) do not rely on petroleum products, so this is not a drawback related to fuel cells.

Answer:

B. hydrogen storage