Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Australian marsupials represent an example of adaptive radiation.

Reason (R): A number of marsupials, all similar to one another evolved from an ancestral stock, but all within the Australian island continent.

In the light of the above statements, choose the most appropriate answer from the options given below.

The adaptive radiation of Australian marsupials is a well-known example of adaptive radiation. A number of marsupials, each different from the other evolved from an ancestral stock. For example, the kangaroo evolved to hop long distances over open grasslands, while the koala evolved to feed exclusively on eucalyptus leaves, which are toxic to most other animals. The bandicoot evolved to forage on the forest floor, while the Tasmanian wolf evolved to be a fierce predator.