Correct Answer: (b) Kaushambi
Solution:Kaushambi in Uttar Pradesh is a famous place of pilgrimage for Buddhists and Jains both. Located on south-western bank of Yamuna river, some 48 km. away from Prayagraj, Kaushambi was an important city in ancient times. As per Jain religious texts, it is the birthplace of 6th Tirthankara 'Padma Prabhu'. There were many 'Viharas' in Kaushambi mainly 'Ghoshitaram'. It was built by 'Shreshti Ghoshit'. The famous 'Ashoka Stupa' is near it. Besides being a centre of Buddhist and Jain religions, Kaushambi was a major trade city where many rich merchants lived.