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Critical Reasoning: Assumption Questions

Country Casa's lakes have been experiencing a constant deterioration in water quality due to too many visitors. Therefore, Casa has decided that the best way to save its lakes is by charging an extra fee to users of the lakes.

Which of the following is an assumption underlying the conclusion?

Incorrect.

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The effect of changing global temperatures is a new premise! It is irrelevant whether this new data supports the conclusion; what you are looking for is the assumption, which should explain how the author drew the conclusion based on the premise which already exists regarding the country's lakes' problems resulting from too many people visiting the lakes.

Incorrect.

[[snippet]]

This answer choice contradicts the conclusion and is a conclusion as well, as can be seen from the words it is clear that. We need to look for an assumption by finding the gap between the premise  and the conclusion.

Incorrect.

[[snippet]]

This answer choice presents a new premise about the falling level of the lakes. It is irrelevant whether this new data supports the conclusion; what you are looking for is the assumption, which should explain how the author drew the conclusion based on the existing premise that overuse of lakes is responsible for their deterioration.

Incorrect.

[[snippet]]

Information about the laws regarding the use of lakes is a new premise. It is irrelevant whether this new data supports the conclusion; what you are looking for is the assumption, which should explain how the author drew the conclusion based on the existing premise.

That's right!

[[snippet]]

This answer choice explains why Casa charged an extra fee to protect the lakes. Why else would it charge an extra fee if the previous one had worked? We are told too that the deterioration has been constant.

Changing global temperatures has been shown to be mostly responsible for the lakes' deterioration.
It is clear that charging higher fees will not be enough to stop the destruction of the lakes.
The level of the lakes in Country Casa has fallen by 20 centimeters per year over the last decade.
Camping at the lakes has never been prohibited.
Higher fees would actually deter a significant amount of people from visiting the lakes.