Question

which of these is a major drawback of using fuel cells in a car?
○ a lack of hydrogen filling stations
○ a drop in reliance on petroleum products
○ an increase in water vapor into the atmosphere
○ an increase in the use of rechargeable batteries

Explanation:

• For "a drop in reliance on petroleum products", this is an advantage as it reduces dependence on non - renewable fossil fuels, not a drawback.
• "An increase in water vapor into the atmosphere" is not a major drawback as water vapor is a relatively benign by - product compared to pollutants from petroleum - based engines.
• "An increase in the use of rechargeable batteries" is not related to the drawbacks of fuel cells in cars as fuel cells and rechargeable batteries are different technologies, and fuel cells don't directly lead to an increase in rechargeable battery use.
• A lack of hydrogen filling stations is a major practical drawback because for fuel - cell cars (which use hydrogen), without a widespread network of filling stations, it is difficult to refuel them, limiting their usability.

Answer:

a. a lack of hydrogen filling stations