Step 1: Understanding the Concept:
The traditional rule of 'locus standi' (only the person whose rights are affected can sue) was a significant barrier to justice for the poor and marginalized. The Supreme Court relaxed this rule to create the mechanism of Public Interest Litigation (PIL).
Step 2: Detailed Explanation:
- Through landmark cases starting in the 1980s (like S.P. Gupta v. Union of India), the Court recognized that "public-spirited" individuals could file petitions on behalf of those who are unable to approach the court themselves.
- This transformation is the hallmark of the evolution of PIL in India, shifting the focus from "who is standing" to "what is the public wrong."
Step 3: Final Answer:
This judicial shift is defined by the evolution of Public Interest Litigation. Option (C) is correct.