The people of Harappa and Mohenjodaro culture belonged to the Chalcolithic Age.

Option 1: New Stone Age - This option is incorrect because the people of Harappa and Mohenjodaro culture did not belong to the New Stone Age. The New Stone Age, also known as the Neolithic Age, was characterized by the development of agriculture and the use of polished stone tools. However, the people of Harappa and Mohenjodaro were more advanced than this stage, as they had established cities with complex urban planning.

Option 2: Copper Age - This option is incorrect because the Copper Age refers to a period of time when copper was widely used for tools and weapons. While copper was indeed used in the Harappa and Mohenjodaro cultures, they were not solely defined by the Copper Age.

Option 3: Iron Age - This option is incorrect because the Iron Age is a later period of human history when iron became the predominant material for tools and weapons. The people of Harappa and Mohenjodaro did not belong to this age, as iron was not commonly used during their time.

Option 4: Chalcolithic Age - This is the correct answer. The Chalcolith