The correct answer is option B, Article 76.

Office of Attorney-General for India:
The Office of the Attorney-General for India is an important constitutional office in India. The Attorney-General is the highest law officer in the country and provides legal advice to the Government of India. Let us understand the relevant article of the Indian Constitution that mentions the Office of the Attorney-General.

Article 76 of the Indian Constitution:
Article 76 of the Indian Constitution deals with the Attorney-General for India. This article outlines the qualifications, appointment, and the duties and functions of the Attorney-General.

Qualifications:
According to Article 76, the Attorney-General must be a person who is qualified to be appointed as a judge of the Supreme Court.

Appointment:
The President of India appoints the Attorney-General for India. The Attorney-General holds office during the pleasure of the President. The appointment of the Attorney-General is of great significance as the person appointed must possess the necessary legal expertise and experience to advise the government on legal matters.

Duties and Functions:
Under Article 76, the Attorney-General has the right to speak and take part in the proceedings of both houses of Parliament or their joint sitting and any committee of the Parliament. The Attorney-General has the right to speak and take part in the proceedings of any State Legislative Assembly or Legislative Council as well. However, the Attorney-General is not entitled to vote.

The Attorney-General acts as the principal legal advisor to the Government of India. The President seeks the opinion of the Attorney-General on matters of legal importance or public interest. The Attorney-General also performs other duties as assigned by the President.

Conclusion:
The Office of the Attorney-General for India is mentioned in Article 76 of the Indian Constitution. This article outlines the qualifications, appointment, and the duties and functions of the Attorney-General. The Attorney-General plays a crucial role in providing legal advice to the government and represents the government in legal matters.