(a). Krishnadevaraya
(b). Narasimha Saluva
(c). Muhammad Shah III
(d). Yusuf Adil Shah
Explanation:
Krishnadevaraya, the illustrious ruler of the Vijayanagara Empire, granted permission to the Portuguese to build a fort at Bhatkal. This strategic move facilitated trade relations and strengthened the alliance between the two powers.
The correct answer is option (a). Krishnadevaraya