Cultural traditions in australasia and oceania remained largely unchanged until civil war between the maoris and the aboriginesthe european "discovery" of the regionthe ice agethe polynesian invasion of new zealand

Option: The European "discovery" of the region

Explanation:

Cultural traditions of Australia aborigines and other Oceanic remain conceal from the world until it was discovered by European in their voyages. The Dutch became the first to navigate these areas than the Spanish explorers followed.  By the arrival of James Cook in 1770 on the east coast of Australia began the colonization.  Australia aborigines and other indigenous suffered from European diseases. Native indigenous began diminishing with diseases and conflict with settlers.

d is the logical answer but im not a 100% sure