Use the map below of Japan's physical and political features to answer the following question: Map of physical features of Japan, showing significant cities, bodies of water, and peaks. The four islands of Japan are shown (Kyushu, Shikoku, Honshu, and Hakkaido), with the Pacific Ocean to the east, the Sea of Japan to the west, and the mainland of Russia, China, and South Korea further to the west.
© 2012 The Exploration Company

Referring to the map, which of the following explains why Japan was often isolated from the influence of its neighbors? (1 point)

It is a group of islands located far from mainland Asia.
It has few natural harbors from which its people could explore.
It contains active volcanoes and has a mountainous terrain.