Correct Answer:
B. 15 years
According to the Constitution of Pakistan, specifically Article 177, a person must have been an advocate of a High Court for at least 15 years to be eligible for appointment as a Judge of the Supreme Court. This foundational legal requirement ensures that individuals appointed to the highest court possess extensive legal experience and a deep understanding of the law.
- Options like 10, 20, or 25 years are incorrect as they do not align with the precise constitutional provisions governing judicial appointments in Pakistan. The 15-year threshold is a specific criterion designed to maintain the high standards of the Supreme Court judiciary.