Which of the following is not a commonly accepted theory on how the first humans arrived in Japan?

A. The first humans arrived from Korea, following the ice and land bridges during the Ice Age.

B. The first humans arrived by boat through a chain of islands that runs through Taiwan to the southern Japanese island of Kyushu.

C. The first humans in Japan were part of the great Polynesian settlement that spread by boat throughout the Pacific islands.

D. The first humans arrived on the island of Hokkaido after leading modern-day Russia.