Which of the following describes renewable energy?

Renewable energy is characterized by its ability to be replenished naturally and sustainably. The correct choice highlights energy sources such as solar, wind, hydroelectric, and geothermal, which continuously regenerate and are less harmful to the environment compared to conventional energy sources. These renewable resources are central to the transition toward sustainable energy systems, as they help reduce greenhouse gas emissions and dependence on finite fossil fuels.

In contrast, the other options pertain to energy sources that rely on materials which are finite and contribute to environmental degradation. Fossil fuels, such as coal and oil, contribute to significant carbon emissions and are not sustainable in the long term. Nuclear energy, while low in greenhouse gas emissions during operation, does not qualify as renewable, as it relies on uranium, a finite resource. Thus, the defining feature of renewable energy is its sustainable nature, making the selection of solar, wind, and similar options the most appropriate.