Question

9 researchers notice small hills streamlined so they suggest that glaciers moved through the area years ago. this suggestion is an example of a
answer
commentary
inference
conclusion
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Explanation:

An inference is a conclusion reached on the basis of evidence and reasoning. Here, researchers observe streamlined small hills and conclude glaciers moved through the area. This is not a definitive answer or conclusion but an educated guess based on observations, which is the nature of an inference. It's not a commentary which is more of an opinion - based explanation, and not a simple answer or conclusion without the reasoning - based aspect.

Answer:

C. inference