Select the correct group/set of Australian Marsupials exhibiting adaptive radiation.

$A$ : Placental wolf and Tasmanian wolf (a marsupial) show convergent evolution.
$R$ : Like marsupials placental mammals in other parts of world also exhibit adaptive radiation in evolving into varieties of such placental mammals each of which appears to be similar to a corresponding marsupial.

The diversity in the type of beaks of finches adapted of different feeding habits on the Galapages islands as observed by Darwin, provides evidence for

Which of the following is a placental mammal not marsupial?