Which of the following is NOT a testable hypothesis regarding the relationship between the eruption and the weather?

A major volcanic eruption put large amounts of dust into the upper atmosphere. For three years following the eruption, Earth’s weather was cooler than normal.

Which of the following is NOT a testable hypothesis regarding the relationship between the eruption and the weather?
A . Volcanic dust can reduce the amount of sunlight entering Earth’s atmosphere.
B . The magnitude of an eruption determines the amount of dust injected into the atmosphere.
C . The smallest volcanic dust particles can remain in the atmosphere for years.
D . If a planet is outside our solar system, volcanic eruptions will affect its weather.
E . Clumps of dust particles can aid cloud formation by acting as sites for condensation.

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Answer: D