The Key Theme of Polynesian Culture from the 7th Century

The key theme of Polynesian culture from the 7th century to 1400 was

A) the adoption of Japanese civilization in the island societies.
B) the development of a uniform written script.
C) contraction as a result of the world-wide epidemic of the 14th century.
D) spurts of migration and conquest that implanted Polynesian culture beyond the initial base in the Society Islands.