Option d is the correct answer. Statement a is true: There are in all four caves on the Barabar hill. The caves are named Lomas Rishi Cave, Sudama Cave, Karan Chaupar Cave, and Visvakarma Cave. Statement b is true: Inscriptions of Ashoka are found on the walls of three caves: Lomas Rishi Cave, Sudama Cave, and Visvakarma Cave. Statement c is true: The inscriptions in the Barabar Hill caves provide information about the dedication of these rock-cut chambers to the Ajivika religious sect, a heterodox sect that flourished in India during the 6th to 2nd centuries BCE. Statement d is not true: The Barabar Hill Caves date from the Maurya Empire ( 322 − 185 322−185 BCE) and bear dedicatory inscriptions from the 3rd century BCE and not 6th century BC, corresponding to Ashoka's era. Important Tips Caves at Barabar Hill: Lomas Rishi Cave: Positioned on the southern side of Barabar Hill, Lomas Rishi is celebrated for its beautifully carved door. Its two rooms include a rectangular chamber ( 9.86 × 5.18 m 9.86×5.18 m ) and a circular, semibemispherical room ( 5 m in diameter). The arched facade emulates contemporary wooden architecture, featuring a row of elephants along the curved architrave. Though unfinished, it holds historical intrigue due to its unique design. Sudama Cave: Located on the southern side as well, Sudama Cave comprises a rectangular room ( 9.98 × 5.94 m 9.98×5.94 m ) and a semi-hemispherical chamber ( 6 m in diameter). Emperor Ashoka dedicated it in 257 BCE, the 12 th year of his reign, to Ajivikas. The interior boasts polished granite surfaces, reflecting sound and creating an echo phenomenon. Karan Chaupar Cave: Positioned on the northern side, Karan Chaupar features a single rectangular room ( 10.2 × 4.27 m 10.2×4.27 m ) with polished surfaces. An inscription by Ashoka, dated around 250 BCE, dedicates the cave to the Ajivikas. The inscription's recent re-reading supports this dedication. Visvakarma Cave: Accessible via Ashoka's steps carved into the cliff, Visvakarma Cave is located east of the main granite hill. It includes a rectangular open space ( 4.27 × 2.54 m 4.27×2.54 m ), a porch-like structure, and an unfinished semi-hemispherical room ( 2.8 m in diameter). Ashoka dedicated this cave to the Ajivikas in 261 BCE, the 12th year of his reign, despite its unfinished state.