The support that Thomas Riggs provides for the counterclaim that Mt. McKinley should not be renamed is: "The name "Denali" is not descriptive." (Option B) See paragraph 6 of the text in the attached.
A counterclaim is a claim that is given to rebuff one that has been made earlier. It could also be a claim given to support one that was rebuffed.
Thus, it is correct to state that The support that Thomas Riggs provides for the counterclaim that Mt. McKinley should not be renamed is: "The name "Denali" is not descriptive."
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