The correct answer is: a) Rojadi.
Rojadi is a village in Bhavnagar district of Gujarat, India. It is located about 100 kilometers from Ahmedabad. The site of Rojadi was excavated in 1963-64 by the Archaeological Survey of India. The excavation revealed a number of artifacts, including pottery, stone tools, and terracotta figurines. The most significant find at Rojadi was a large number of rice grains. These rice grains were carbon dated to 2600-2400 BC, making them the earliest evidence of rice cultivation in Gujarat.
The other options are incorrect. Lothal is a Harappan site located in Ahmedabad district of Gujarat. Rangpur is a Harappan site located in Kutch district of Gujarat. Kanme is a Chalcolithic site located in Junagadh district of Gujarat.
Rojadi is a significant archaeological site because it provides evidence of the early development of agriculture in Gujarat. The discovery of rice grains at Rojadi suggests that rice was being cultivated in Gujarat as early as 2600-2400 BC. This is significant because it shows that Gujarat was an important center of agriculture at a very early stage in its history.