The best answer in regards to the specific question appears to be A: Many small towns boomed as people came to drill wells.
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Colloquial? I think. Hope this helps
Answer: Starting at the end of the 10th century, Vikings established hundreds of scattered farms along protected fjords, where they built their homes and churches. Life was good living alongside the edge of the glaciers, but by the 15th century the conditions had cooled dramatically, putting an abrupt end to their farming lifestyle. It's this change, say anthropologists, that caused extensive crop failure and starvation — forcing them to return back to Europe.
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