Answer:
The correct answer will be option-D.
Explanation:
A scientific hypothesis is a proposed idea based on the previous research which could be tested with the experiments.
In the given question, the researcher observed how the Opossum has spread in the U.S and suggested the reasons.
The suggested reason represents that he has predicted why they have spread in the entire U.S? which could be his imagination based on previous work. This proposed educated guess is known as a scientific hypothesis and thus is the correct answer.
