Understanding the World's Most Polluted River

The question asks us to identify the river often cited as the world's most polluted river from the given options. River pollution is a significant environmental issue globally, impacting ecosystems and human health.

Let's look at the options provided:

• Ganga River
• Chenab River
• Cauvery River
• Yamuna River

Among these rivers, the Ganga River is frequently mentioned in studies and reports as one of the most severely polluted rivers in the world, particularly in certain stretches. This pollution is attributed to various factors, including untreated sewage, industrial waste, agricultural runoff, and religious practices.

While other rivers listed, like the Yamuna River, are also known to be heavily polluted, the Ganga River often receives the designation of being among the world's most polluted due to the sheer volume of pollutants and its critical role for a massive population.

Considering the available information and common understanding regarding river pollution levels, the Ganga River fits the description of being called the world's most polluted river.

Therefore, the correct answer is Ganga River.