According to a study a progressively drying climate along with unpredictable weather may have caused...........

Logical Reasoning(Master ) Statement - Assumptions

According to a study, a progressively drying climate along with unpredictable weather may have caused the evolution of anatomically modern humans. The sediment cores in the rift valley of East Africa is known for its rich source of human fossils. Reports claimed that the larger brains of anatomically modern humans allowed human ancestors to the rapidly changing climate.

The larger brains of anatomically modern humans are due to the progressively drying climate along with unpredictable weather.

The assumption is ‘definitely true’ i.e. it properly follows the statement of facts given.

The assumption is ‘probably true’ though not ‘definitely false’ in the light of facts given.

The data is inadequate i.e. from the facts given you cannot say whether the assumption is likely to be true or false.

The assumption is ‘probably false’ though not ‘definitely false’ in the light of facts given.

The assumption is ‘definitely false’ i.e. if the inference is not simply be drawn from the facts given or it contradicts the given facts.

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Master Statement - Assumptions

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Explanation:

A progressively drying climate along with unpredictable weather may have caused the evolution of anatomically modern humans.
So, may be the larger brains are the result of evolution due to the climate changes.
Hence, the option 2 is the correct solution.