Final answer:
Pollution in the Yangtze and Ganges rivers negatively impacts the health and agriculture of local populations in China and India, contributing to waterborne diseases and economic challenges.
Step-by-step explanation:
The pollution of the Yangtze and Ganges rivers significantly affects the people living in China and India, respectively. These major waterways are integral to the regions' agriculture, health, and daily life. Pollutants such as untreated sewage, industrial waste, chemicals, and agricultural runoff contribute to waterborne diseases, decreased water quality, and can lead to health issues among the local populations.
Drinking water and agricultural practices suffer when rivers become contaminated, as pollutants can enter the food chain and result in the consumption of harmful substances like mercury. Economic development and quality of life are also hampered by these environmental issues. High levels of pollution have been directly linked to increased health costs, reduced GDP, and the occurrence of 'dead zones' in aquatic ecosystems.
Therefore, the correct answer to the student's question is (c) It harms the health of those who rely on the rivers for drinking water and agriculture, which proves that water pollution not only poses environmental risks but also socio-economic challenges for the affected populations.