alyssapignataro1 alyssapignataro1 Today at 6:19 PM History Answered Which would best explain why early communities in a region have little contact with other cultures? A. A river and its tributaries change course over time. B. People settle near a river where it empties into the sea. C. The natural features in an area include high mountains, large deserts, and oceans. D. A large river floods annually.