Answer:
D. If different types of leaves are exposed to low temperatures, then they will change colors.
Explanation:
This is true but in a hypothesis, it doesn't matter what is true or not, but this sentence totally says that that is true. IT IS SAYING IT BOLDLY. That is why I think this sentence is the most proper hypothesis here.
But, don't think that I only THINK that option is true, it is actually true.
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