Option d is the correct answer. Simuka was the founder of the Satavahana dynasty. He is mentioned as the first king of the Satavahana dynasty in various inscriptions, including one at Nanaghat. The Satavahana dynasty was a prominent ancient Indian dynasty that ruled over the Deccan region. Simuka's reign is estimated to have taken place in the 1st century BCE, possibly around 120-96 BCE. 50. Solution: (c) Exp) Option c is the correct answer. Shankaracharya did not name Prayag as Teerthraj, which means "the king of holy places". Prayag, also known as Allahabad, is a city in Uttar Pradesh. It is where the confluence of the Ganges, the Yamuna and the mythical Saraswati rivers takes place. This confluence is known as Triveni Sangam and is considered very sacred by Hindus. Prayag is also one of the four venues for the Kumbh Mela, a mass pilgrimage that occurs every 12 years. The name Teerthraj was given to Prayag by ancient Hindu scriptures and sages, long before Shankaracharya's time. Shankaracharya countered the spread of Buddhism and Jainism by engaging in debates and dialogues with their proponents and by reviving the Vedantic philosophy of the Upanishads. Shankaracharya propagated Vedanta as the supreme philosophy that reveals the true nature of Brahman, the ultimate reality, and the identity of the individual self with Brahman.