The most accurate answer to why Polynesia was the last part of Oceania to be settled is:
A) Polynesia was the furthest area from the mainland.
Polynesia is characterized by its comparatively isolated islands that are located farther from the main landmasses of Oceania, which made it logistically more challenging for early settlers to reach and settle in this region. The vast distances between the islands also posed significant navigation challenges during the early periods of migration.