Theory, assumption, and educated guess are all another way of saying hypothesis. In school we were always told another word for hypothesis was educated guess but as stated before, any of them should work.
Answer:
Rutherford's atomic model became
known as the nuclear model.
In the nuclear atom the protons and neutrons
which comprise nearly all of the mass
of the atom , are located in the nucleus
at the center of the atom.
The electrons are distributed
around the nucleus and
occupy most of the
volume of the atom.
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I think the answer would be B but none of them are great. Continental drift is the gradual movement of our land masses. Knowing this we can eliminate option D because it identifies buildings as a cause. A and C both discuss climate change which is not a product of continents moving. The elimination leaves option B however because these changes would occur gradually, it is unlikely that species would become invasive.
Thin soil should be the answer, but it could be different based on your answer choices, do you have any?