Which of the following people didn't inhabit the Oceania region (including Australia and New Zealand)?

Harappan

The correct answer is Option 2- Harappan

The Harappan Civilisation existed around the Indus River in present-day India and Pakistan.

Present day island states in the Oceania region (including Australia and New Zealand), were inhabited by the Polynesian, Melanesian and Micronesian people over the course of thousands of years. They appeal to governments to come to terms with the continuing existence of indigenous nations as enduring communities with an identity of their own. ‘Since times immemorial’ is the phrase used by indigenous people all over the world to refer to their continued occupancy of the lands from which they originate.