In the introductory paragraph of an argument, the type of claim did the author make is a policy claim, i.e., option B.
A policy claim is one about an actionable topic. It is an argumentation thesis that makes a claim about a course of action that the reader should take, i.e. a policy.
In the introductory paragraph of an argument, the type of claim the author make is a policy claim.
Thus, the correct option is B.
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