It started september 1, 1939 .
I believe itA is the correct answer
It would be much better if you attached the chart to find right answer. I suggest you to search the chart and compare all definitons. Then you can consolidate some to get the answer.
Answer: the correct answer is c) adulthood. The correct sentence will be A civilization reaches its high point during its <u>adulthood</u> stage.
Explanation: every civilization experiences a process: first, it is born then it grows, after that, it reaches its highest point and at the end, it declines.
Our technology is improved compared to the past that makes transporting goods easily. This will reduce the price of the goods by the difficulty of transport.