Which is the least polluted ocean in the world?

The South Pacific Ocean is widely regarded as the least polluted ocean in the world. This vast body of water stretches between Australia, South America, and the islands of Oceania, covering an area larger than any other ocean except the North Pacific. Despite its size, it is relatively free from pollution compared to oceans like the Atlantic, Indian, and Arctic, which are closer to heavily populated and industrialized regions.

One major reason for its low pollution levels is geographical isolation. The South Pacific is bordered mostly by countries with lower levels of industrialization and population density, compared to regions around the North Atlantic or Indian Ocean. This reduces the amount of industrial waste, untreated sewage, and plastic debris entering the water.

Another factor is the ocean currents. The South Pacific experiences strong circulation patterns, including the South Pacific Gyre, which helps disperse pollutants more effectively, preventing the buildup of floating garbage patches like those found in the North Pacific. Additionally, the presence of vast open waters with fewer coastal cities contributes to its relative cleanliness.

In contrast, the Indian Ocean is one of the most polluted due to dense coastal populations and industrial discharge, while the Arctic Ocean suffers from oil exploration and the effects of climate change. The North Pacific contains the infamous Great Pacific Garbage Patch, a large accumulation of plastic waste.

However, it is important to note that no ocean is entirely free from pollution. Even the South Pacific has microplastics and traces of chemical contaminants carried by winds and currents. Still, compared to other oceans, its pollution levels remain significantly lower.

Therefore, the correct answer is the South Pacific Ocean, making Option C the right choice.