Answer:
a) New Zealand.
b) Melanesia, Polynesia and Micronesia
Step-by-step explanation:
Australasia is a combined name given to the group of islands present in the southern pacific ocean. This includes Australia, New Guinea and New Zealand.
Hence,
the correct option is New Zealand.
Now, the second part of the question
The Oceania consists of three main regions which are Melanesia, Polynesia and Micronesia