Assertion (A) is true. Saluva Narasimha was a powerful general under the Sangama dynasty of the Vijayanagara Empire. Observing the decline and weakness of the ruling king, Praudharaya, Saluva Narasimha staged a bloodless coup (known as the 'First Usurpation') in 1485, ending the rule of the Sangama dynasty and establishing the Saluva dynasty. He assumed the royal title. Reason (R) is true. The later rulers of the Sangama dynasty were weak and ineffective, leading to internal problems and making the kingdom vulnerable to external threats, particularly from the Bahmani Sultanate and the Gajapatis of Odisha. Saluva Narasimha's action was primarily aimed at strengthening the kingdom's administration and defense to prevent its disintegration. Reason (R) correctly explains Assertion (A). Saluva Narasimha overthrew the old dynasty and took power precisely because he believed it was necessary to save the kingdom from the degeneration and disintegration caused by weak rule. His motive was to restore stability and strength to Vijayanagara.