The correct answer is B. Pollution of river water by industrial pollution.
Step-by-step explanation
The global water crisis is one of the most important problems on earth because it affects one of the most important resources. After all, water is an irreplaceable resource for plants, animals, and humans. However, in recent years, waste from large industries has been dumped into rivers and this has seriously contaminated this resource, putting humanity and other species of terrestrial and aquatic fauna and flora at risk. According to the above, the correct answer is B. Pollution of river water by industrial pollution.