- Statement A is true: There are four caves on the Barabar hill: Lomas Rishi, Sudama, Vishwakarma, and Karan Chaupar. - Statement B is true: Ashokan inscriptions are found on the walls of three of these caves (Sudama, Vishwakarma, and Karan Chaupar). Lomas Rishi has no Ashokan inscription, though its facade is famous. - Statement C is true: The inscriptions explicitly mention the dedication of these caves to the Ajivikas, a non-Vedic ascetic sect, by Emperor Ashoka. - Statement D is false: The inscriptions are dated to the 12th regnal year of Emperor Ashoka, which corresponds to approximately 257 BCE. Ashoka reigned in the 3rd century BCE, significantly later than the 6th century BCE (which is roughly the period of Mahavira and Buddha).