Tasmanian tiger cat is a marsupial while Bobcat is a placental mammal. This shows :

Convergent evolution .

The correct answer is Option (2) – Convergent evolution .

The scenario described, where the Tasmanian tiger cat is a marsupial while the Bobcat is a placental mammal, exemplifies: Convergent evolution.

A number of marsupials, each different from the other  evolved from an ancestral stock, but all within the Australian island continent. When more than one adaptive radiation appeared to have occurred in an isolated geographical area (representing different habitats), one can call this convergent evolution. Placental mammals in Australia also exhibit adaptive radiation in evolving into varieties of such placental mammals each of which appears to be ‘similar’ to a corresponding marsupial (e.g., Placental Bobcat and Tasmanian tiger cat-marsupial).

        Picture showing convergent evolution of Australian Marsupials and placental mammals