Correct option is A
The Simhastha fair, also known as the Ujjain Kumbh Mela, is held in Ujjain on the banks of the Shipra River. This correct option (a) Shipra river.
• The Kumbh Mela in Ujjain is a major Hindu festival that is held once every 12 years and is one of the largest religious gatherings in the world. It is marked by a mass Hindu pilgrimage during which devotees gather to bathe in a sacred river. The event is based on Hindu mythology, which says that Lord Vishnu dropped drops of amrita (the drink of immortality) at four places, while transporting it in a kumbha (pot). These four places, including Ujjain, have been celebrated as sacred sites of the Kumbh Mela.
• Ujjain's Kumbh Mela is specifically celebrated on the banks of the Shipra River, a river that is considered holy in Hinduism and is central to the religious life of the city. The fair includes various religious ceremonies, spiritual discourses, devotional singing, and ritualistic bathing at the ghats of the Shipra River. This event not only serves as a spiritual meeting for devout Hindus but also as a means for people to cleanse themselves of sins and achieve moksha (liberation).