16.
The answer is: D
Explanation
The correct option is D: All of the above.
According to Section 49 of the Advocates Act of 1961, the Bar Council of India has the power to make rules for discharging its functions under this Act, and in particular, such rules may prescribe various matters, including the ones mentioned in options A, B, and C. This section gives the Bar Council of India a wide scope of authority to regulate the legal profession in India and to ensure its standards and ethics.