Which of the following is a listed pro of dams?

• A. Hydroelectricity
• B. Flooded land destroys forests/croplands and displaces people
• C. Risk of failure and causing downstream flooding
• D. Increases tourism in the area

Answer: (A)

The main idea being tested is that the most widely recognized benefit of dams is the ability to generate electricity from stored water—the hydroelectric power they produce. Hydroelectricity works by using water stored in a dam’s reservoir to spin turbines as it is released. Those turbines drive generators to produce electricity, providing a renewable energy source with relatively low emissions during operation. This helps meet electricity demand without burning fossil fuels and can be scaled to supply power to grids, sometimes with added flexibility through pumped-storage options.

The other options describe drawbacks or less universal benefits: flooding and displacement from reservoir creation, the risk of dam failure and downstream flooding, and tourism effects that can vary by location. While some dams may influence tourism, hydroelectric power is the clear, direct pro commonly cited as a major advantage.