Where were the imperial mammoths the dominant type of...

Câu hỏi: Read the passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from.
The time when humans crossed the Arctic land bridge from Siberia to Alaska seems remote to us today, but actually represents a late stage in prehistory of humans, an era when polished stone implements and bows and arrows were already being used and dogs had already been domesticated.
When these early migrants arrived in North America, they found woods and plains dominated by three types of American mammoths. Those elephants were distinguished from today's elephants mainly by their thick, shaggy coats and their huge, upward-curving tusks. They had arrived on the continent hundreds of thousands of years before their human followers. The woolly mammoth in the North, the Columbian mammoth in middle North America, and the imperial mammoth of the South together with their distant cousins the mastodons, dominated the land. Here, as in the Old World, there is evidence that humans hunted these elephants, as shown by numerous spear points found with mammoth remains.
Then, at the end of the Ice Age, when the last glaciers had retreated, there was a relatively sudden and widespread extinction of elephants. In the New World, both mammoths and mastodons disappeared. In the Old World, only Indian and African elephants survived.
Why did the huge, seemingly successful mammoths disappear? Were humans connected with their extinction? Perhaps, but at the time, although they were hunters, humans were still widely scattered and not very numerous. It is difficult to see how they could have prevailed over the mammoth to such an extent.
Where were the imperial mammoths the dominant type of mammoth?
A. Alaska
B. the central portion of North America
C. the southern part of North America
D. South America