Post-Harappan culture refers to the period which followed the decline and disappearance of the Indus Valley Civilization (also known as Harappan Civilization). This period is also known as the Late Harappan period. The culture that prevailed during this period was characterized by regionalism, smaller settlements, and a shift towards agriculture.

The correct answer to the given question is option B, i.e. Rangpur and Rojdi. Let us discuss why this option is correct:

• Rangpur and Rojdi are two important archaeological sites located in Gujarat, India.

• These sites have revealed evidence of the post-Harappan culture that existed in the region after the decline of the Indus Valley Civilization.

• At Rangpur, archaeologists have found pottery, beads, and other artifacts that suggest the presence of a post-Harappan culture.

• Similarly, at Rojdi, excavations have revealed a fortified settlement with evidence of small-scale industrial activity, including pottery-making and bead-making.

• The post-Harappan culture at Rangpur and Rojdi was characterized by a shift towards agriculture and animal husbandry, as well as the emergence of regionalism and smaller settlements.

• Other sites where post-Harappan culture has been found include Kalibangan and Banwali in Rajasthan, and Amri and Kot Diji in Sindh, Pakistan. However, the correct answer to the given question is option B, i.e. Rangpur and Rojdi.

In conclusion, the post-Harappan culture that emerged after the decline of the Indus Valley Civilization has been found at various archaeological sites in India and Pakistan. Rangpur and Rojdi are two such sites in Gujarat where evidence of this culture has been found.