**Core Concept**
The question is testing the knowledge of the purest form of water found in nature. Water from natural sources can vary in quality due to the presence of impurities, dissolved minerals, and other substances. The purest form of water is typically found in a specific natural environment.

**Why the Correct Answer is Right**
The purest water in nature is found in **glaciers**. Glaciers are formed from compressed and recrystallized ice, which is free from many of the impurities and dissolved substances found in other natural water sources. The water in glaciers is also relatively stable and unchanged over long periods, making it a reliable source of pure water. This is due to the slow and continuous process of ice formation, which allows for the removal of impurities through the process of **dolutation**.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not specified, so it cannot be evaluated.
* **Option B:** While some natural springs may have pure water, they can also be contaminated by the surrounding environment, making them less reliable than glaciers.
* **Option C:** This option is not specified, so it cannot be evaluated.
* **Option D:** This option is not specified, so it cannot be evaluated.

**Clinical Pearl / High-Yield Fact**
It's worth noting that while glaciers provide the purest form of water in nature, they can also be a source of **glacier water**, which can be used for drinking, irrigation, and other purposes. However, glacier water can also be contaminated with minerals and other substances that are dissolved in the ice, so it's essential to properly treat and filter the water before consumption.

**Correct Answer:** C.