The correct answer is option (b). Rishi Kund is located in Munger, Bihar, not Rajgir.
Sita Kund, Surya Kund, and Brahma Kund are all located in Rajgir, Bihar. Sita Kund is a sacred spring that is said to have been used by Sita, the wife of Rama, during her exile in the forest. Surya Kund is a hot spring that is said to have healing properties. Brahma Kund is a cold spring that is said to be sacred to Brahma, the creator god.
Rishi Kund is a sacred spring that is located in Munger, Bihar. It is said to have been used by the sages (rishis) in ancient times. The water of Rishi Kund is said to have healing properties.