The best explanation for why large groups of people in different areas speak the same language with minor variations would be:
B: a long-ago migration
This option suggests that speakers of the same language migrated to different regions, resulting in the same language being spoken with variations that developed over time due to geographical, social, and cultural factors. The other options may contribute to language spread or variation, but a historical migration would be a primary reason for widespread similar language usage across different areas.
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