How did isolation affect culture in Oceania

Oceania thus has the most to lose, culturally speaking, from the pressures of global political and economic change. Due to colonial neglect and historical isolation, the Pacific Islands, home to the world's most diverse range of indigenous cultures, continue to sustain many ancestral life-ways.

Explanation:

Oceania is a geographic region that includes Australasia, Melanesia, Micronesia and Polynesia. Spanning the eastern and western hemispheres, Oceania has a land area of 8,525,989 square kilometres and a population of over 47 million. Situated in the southeast of the Asia-Pacific region, Oceania, when compared to continental regions, is the smallest in land area and the second smallest in population after Antarctica.

the answer would be:

b. race