The answer is: C
Explanation
Here are the duties of an advocate in India, as per the Advocates Act, 1961
1. Duty to uphold the dignity and decorum of the court.
2. Duty to maintain confidentiality and protect the interests of the client.
3. Duty to act in a manner that is consistent with the best interests of the client.
4. Duty to not disclose any information that is communicated by the client.
5. Duty to not appear in a case in which the advocate believes that she will be a witness.
6. Duty to not foment litigation.
Based on these duties, option C. does not describe a duty of an advocate. An advocate does not have a duty to protect any information that the client communicates, even if it is in furtherance of an illegal purpose.
Therefore, option C is the correct answer.