Which of the following is a con of fossil fuels?

• A. Non-renewable
• B. Renewable energy
• C. Clean energy
• D. Low cost

Answer: (A)

The main idea here is that a major drawback of fossil fuels is that they are non-renewable. They exist in finite amounts and form over millions of years, so once we burn them for energy, those resources are effectively gone on human timescales. This can lead to supply shortages, price volatility, and greater dependence on imports or unstable markets as demand continues. That’s why non-renewable is described as the drawback. The other options refer to positive qualities—renewable energy and clean energy describe beneficial alternatives, and low cost is typically an advantage of fossil fuels rather than a disadvantage.