Biology

The correct answer is: C.Human activities.

Human activities, such as industrial waste, agricultural runoff, sewage discharge, and plastic pollution, are the primary causes of water pollution. These activities introduce harmful chemicals, toxins, and debris into water bodies, significantly impacting water quality and ecosystems.

While natural processes (like decaying plants or volcanic eruptions) can contribute to some water pollution, human activities are the primary cause, especially in populated areas.

Here's why the oth...