Public Interest Litigation (PIL) is a legal practice that takes a more inclusive approach to providing justice, where even individuals or groups with no direct involvement in a legal dispute can invoke the jurisdiction of the court for the betterment of society. This concept originated in the United States, making option 3 the correct answer.

Options 1, 2, and 4 are not accurate because PIL did not originate in the United Kingdom, Australia, or Canada. Although these countries do have their own versions of public interest litigation or similar mechanisms in practice, the actual concept of PIL took root in the United States in the 1960s, serving a broader and more accessible role for the public in legal proceedings. As this concept has been embraced globally, these countries have recognized and adopted the concept, but they are not the originators of PIL. Hence, options 1, 2, and 4 should be disregarded when asked about the origin of PIL.