The Kadambas established their capital city in Goa at:

Chandor
Banavasi
Goa-Velha
Madgaon

The correct answer is: Chandor.

The Kadambas were a dynasty that ruled over parts of present-day Karnataka and Goa from the 6th to the 14th centuries. They established their capital city at Chandor, which is located in the northern part of Goa. Chandor was a prosperous city during the Kadambas’ rule, and it was home to many temples, palaces, and other important buildings. The city was also a major center of trade and commerce.

The Kadambas were a Hindu dynasty, and they were patrons of the arts and literature. They built many temples and other religious structures, and they also supported many scholars and poets. The Kadambas were a powerful dynasty, and they played an important role in the history of Goa.

The other options are incorrect because they are not the capital city of the Kadambas in Goa. Banavasi was the capital of the Kadambas in Karnataka, Goa-Velha was the capital of the Portuguese in Goa, and Madgaon is a city in Goa that was not founded by the Kadambas.