To solve this problem, we need to identify the correct group of Australian marsupials that exhibit adaptive radiation. Adaptive radiation is the process by which organisms diversify rapidly into a multitude of new forms, particularly when a change in the environment makes new resources available, creates new challenges, or opens new environmental niches.$\newline$Let's analyze each option:$\newline \bullet$Option 1: Tasmanian wolf, Bobcat, Marsupial mole$\newline$ - The Tasmanian wolf (Thylacine) is a marsupial, but the Bobcat is not a marsupial; it is a placental mammal.$\newline$ - The Marsupial mole is indeed a marsupial, but the presence of the Bobcat makes this group incorrect.$\newline \bullet$Option 2: Numbat, Spotted cuscus, Flying phalanger$\newline$ - All three are marsupials native to Australia.$\newline$ - The Numbat is an insectivorous marsupial, the Spotted cuscus is an arboreal marsupial, and the Flying phalanger is a gliding marsupial.$\newline$ - This diversity in lifestyle and habitat is indicative of adaptive radiation.$\newline \bullet$Option 3: Mole, Flying squirrel, Tasmanian tiger cat$\newline$ - The Mole and Flying squirrel are not marsupials; they are placental mammals.$\newline$ - The Tasmanian tiger cat (Dasyurus) is a marsupial, but the presence of non-marsupials makes this group incorrect.$\newline \bullet$Option 4: Lemur, Anteater, Wolf$\newline$ - None of these are marsupials; they are placental mammals.$\newline$ - This group is incorrect for Australian marsupials.$\newline$Therefore, the correct group of Australian marsupials exhibiting adaptive radiation is Option 2: Numbat, Spotted cuscus, Flying phalanger.