I was a little confused at first, but now I think clearly. In fact, as far as the materials given in this question are concerned, both B and C are right, but compared with them, C is not what historians should emphasize in this sentence. When both B and C are correct statements, find out which one is more in line with the meaning of the question. The whole sentence is about the division of historical process and times. He thinks that his own point of view can replace the original one, so he should find out the key points and basis in this whole sentence.

B. it is correct to say that the historical development process of mankind has changed from decentralization to integration. In ancient times, I think it refers to ancient Greece, which means that ancient Greece and Rome were the center of European historical development at that time and the center of world historical development. It can be said that everyone knows that ancient Greece has made important contributions to the development of human civilization, but the development of ancient Greece is limited to ancient Greek countries. The European era refers to the Renaissance from the Eastern Roman Empire to the end of 13. The Renaissance is called the dividing line between the Middle Ages and modern times, and its influence on the historical development of Europe is self-evident. Its scope has expanded compared with that of ancient times, affecting the whole of Europe. In the last modern time, I think it should be regarded as the beginning of the industrial revolution, right? Among them, there are outstanding figures in Europe and America who promote historical progress. It can be said that the industrial revolution was initiated in Europe and then transferred to the development of the United States, but it did not affect the development status of the United States centered on the Atlantic Ocean. This development promoted the historical development process of mankind all over the world.

I think historians want to divide the progress of the times by the progress and expansion of historical civilization, so they named the times Mediterranean, Europe and Atlantic. I wonder if you are satisfied?