Hey!
Hope this helps...
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The correct answer is: D.) Personality
This is because, this is a survey (but on a much larger scale) that talks about the type of people in the geographical position on the map. It is much easier/faster to calculate the type of people there are in that place.
For Example, this is what that survey would look on paper:
"In Kentucky 50% of the people who live there are Caucasians, 36% of the people who live there are under the age of 21yrs old, and 69% of the people who live there are Males..."
Because this is on a much larger scale, it would be very hard to say that: "<em>blah</em> amount of people who live in <em>ExampleState</em> are Nice and friendly". As you cannot find this out in a database, nor if you never meet the person who is "Nice and Friendly"