Drop the State field to a view, you will get >1k unknown.
Drop the Country to the Filters Shelf and Select the United States, all unknowns should be gone.
Also, drop the Order Date to the Filters Shelf and choose Years as:
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Check for the Year 2013.
Drop the Sales field to the Label in the Marks card, your view should look like this:
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Now use the Lasso Selection tool from the Map tools:
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And create the group of states as per our answer options.
Example - for New York, Massachusetts, Rhode Island, Similarly, do for other 3 options as well.
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Duplicate this worksheet and remove the Latitude and Longitude from the view and drop this new dimension of groups to the view. California, Idaho, Nevada is the right answer.
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