Answer :

A) 200 km

Hope I helped!
If you want, you can always go to Google. They have a conversion tool where you can convert things like meters to miles, so that you understand a bit better of what's reasonable. (:
A reasonable distance between 2 cities WOULDN'T be B, C, or D, because that distance isn't even as long as 2 houses, so that leaves you with A.

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