The sentence in Lauren's letter that contains the warrant part of the argument is B, because it anticipates the reasoning behind a claim.
It corresponds to the anticipation of details of the argument that may not be accepted by the audience, explaining the reasoning and interpretation of data that support the allegation present in the argument.
So the correct alternative is:
B. At the same time, transforming yards and vacant properties into natural areas makes good sense. It will benefit wildlife, make our neighborhoods more beautiful, and increase property values.
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