Which of the following best describes surface water?

Surface water refers specifically to water that is found in natural bodies such as rivers, lakes, and reservoirs. This type of water is directly accessible and is a key component of the Earth's hydrological cycle. Surface water is crucial for various ecological systems and human use, as it can provide drinking water, irrigation for agriculture, and habitats for wildlife.

In contrast, water extracted from underground sources pertains to groundwater, which is stored in aquifers and accessed through wells. The reference to aquifers indicates a different category of water sources, emphasizing the distinction between surface water and groundwater.

Moreover, while purified water might be involved in various treatment processes before becoming safe for consumption, it does not specifically fall under the definition of surface water. Therefore, the clear distinction and characteristics of surface water are best captured by the correct answer, which directly denotes its presence in rivers, lakes, and reservoirs.