The correct answer is: A) Krishnadevaraya.
Krishnadevaraya was the most powerful ruler of the Vijayanagara Empire. He reigned from 1509 to 1529 CE. During his reign, the empire reached its zenith of power and glory. The empire exerted control over parts of Telangana, particularly during the reign of Krishnadevaraya.
Harihara I and Bukka Raya I were the founders of the Vijayanagara Empire. They reigned from 1336 to 1356 CE. During their reign, the empire was still in its early stages of development. It was not until the reign of Krishnadevaraya that the empire reached its zenith of power and glory.
Devaraya II was the son of Krishnadevaraya. He reigned from 1529 to 1542 CE. During his reign, the empire began to decline. This was due to a number of factors, including internal strife and external threats.
In conclusion, the correct answer is: A) Krishnadevaraya.