prove that the people traded over long distances. A. Ancient tree stumps, discovered by scientists, b. Written records c. Buildings that were built with logs from mountains about 50 miles away d. Oral traditions Please select the best answer from the choices provided A B C D

c. Buildings that were built with logs from mountains about 50 miles away

Explanation:

Buildings made of logs from mountains about 50 miles away are the evidence of traders over distances because people need a shelter at a place for trading and they form buildings with logs.

Traders migrate to other places for trading nearby 30-50 miles, they make the same designed building for shelter and move ahead after their trade is done and leave the building as it is.

Hence, the correct answer is "c".

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