The classical example of adaptive radiation during formation of new species is

Darwin's finches are an established case of a versatile radiation. Their regular predecessor touched base on the Galapagos around two million years prior. Amid the time that has passed Darwin's finches have developed into 15 perceived species varying in body estimates, mouth shape, melody and nourishing conduct. Changes in the size and type of the snout have empowered distinctive species to use diverse nourishment assets such us creepy crawlies, seeds, nectar from desert flora blooms and in addition blooded from iguanas, all determined by Darwinian determination.

So, the correct option is 'Marsupials of Australia'.