Which one of the following is not true about the Barabar hill caves?

• A. There are in all four caves on the Barabar hill.
• B. Inscriptions of Ashoka are found on the walls of three caves.
• C. These inscriptions inform us about the dedication of these caves to the Ajivikas.
• D. These inscriptions date back to 6th century B.C. century BC.