Question

Which would best explain why a city would begin, grow, and prosper from trade? 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.

Answer 1

I would say A.

The reason being that if you're close to a river there is a way of transportation through the river. Also, some of the most successful civilizations started near rivers. So you are bound to find some other civilizations to trade with.

Answer 2

The right answer is option B. People settle near a river where it empties into the sea. Even though option A is partially right, the most important merchant cities have been located near the sea/ocean and a river. Take for example Egypt or New Orleans. If a city is located in this situation, then it can easily start commerce with the inland regions (thanks to the river) and foreign nations (thanks to the sea proximity).