Correct Option: A

The terms Lokayata and Carvaka have historically been used to denote the philosophical school of Indian Materialism. Carvaka and Ajita Kesakambalin are said to have established Indian Materialism as a formal philosophical system, but some still hold that Brihaspati was its original founder. Brihaspati authored the classic work on Indian Materialism, the Brihaspati Sutra.