industrial effluents
thermal plant discharge
raw sewage disposal
crude oil spillage
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I disagree because the answer is A. Industrial effluents contain nitrate or phosphate containing chemicals like fertilizers that actually cause the algae to bloom thereby causing hypoxia (low oxygen levels)

The correct answer is:
C. raw sewage disposal
Algal blooms often result from the high levels of nutrients, especially nitrogen and phosphorus, which are commonly found in raw sewage. When these nutrients are released into water bodies, they promote rapid algae growth, which can deplete oxygen levels, leading to hypoxic conditions and harming aquatic life.

raw sewage disposal consist of water containing excrement , industrial release and debris and this can cause growth of bacteria and harmful microorganisms.
For this reason,i agree with the answer above

