Answer:
There was no map provided with this question as of me answering, but as you said "4 is District of Columbia", then 4 would be the location of Washington, D.C., as D. C. stands for District of Columbia
Step-by-step explanation:
4
Looking at the map I provided (I'm taking the test rn) I am inclined to believing it is 4 because Washington D.C is in Maryland and 4 is the closest number to it. :)
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