Who of the following rulers of medieval India gave permission to the Portuguese to build a fort at Bhatkal?

Bhatkal, a port town on the Karnataka coast, came under the Vijayanagara Empire. Krishnadevaraya (1509–1529), the greatest ruler of the Tuluva dynasty of Vijayanagara, maintained friendly relations with the Portuguese to secure horses from them and to counter the Bijapur Sultanate. He granted the Portuguese permission to build a fort at Bhatkal as part of this strategic alliance. Narasimha Saluva ruled earlier (15th century) before Portuguese arrival in 1498. Muhammad Shah III was a Bahmani ruler, and Yusuf Adil Shah founded the Bijapur Sultanate but Bhatkal was not under his control. Hence the correct answer is Krishnadevaraya.