Answer: (Detailed Solution Below)
Option C: P.N. Bhagwati
Detailed Solution:
The correct answer is “P.N. Bhagwati”.
Public Interest Litigation (PIL) began to take shape under Chief Justice P. N. Bhagwati's leadership in the early 1980s. A landmark moment in this regard was the case "Hussainara Khatoon v. State of Bihar", which was decided in 1979. This case is often considered one of the early cases of Public Interest Litigation (PIL) in India.