Hope this helps. I typed that in notes.
The answer is D optimistic
The source of pollution in Lake Erle sewage and Phosphate-containing particles. The point source is discharge pipe while the non-point source of pollution are various ways pollutant is been disposed on the lake.
<h3>What is point source and nonpoint source pollution?</h3>
The Point Sources of a Pollution is one that comes from a single and a source that can be identified example is discharge or drainage pipe that takes waste from a factory or sewage plant.
Note that Pollution that does not have a place where it is coming from is known as nonpoint-source pollution such as wind, run off water carrying waste, etc.
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The given situation represents the example of a clinical/case study of the research method.
<h3>What is a clinical/case study?</h3>
A clinical case study refers to the case study where the doctors share the cases of patients that are not common or not explained before. In this, the permission of the patient should be required for writing the report on the clinical case.
Hence, we can conclude that The given situation represents the example of a clinical/case study of research method.
Learn more about research here: brainly.com/question/16778033
