Explanation

The Naz Foundation (India) Trust filed the pioneering 2001 public interest litigation challenging the constitutionality of Section 377 of the Indian Penal Code, which led to the 2009 Delhi High Court verdict and eventually the Supreme Court's 2018 Navtej Singh Johar judgment decriminalizing consensual same-sex relations. The other organizations listed were not the petitioners in this challenge. Hence option A is correct.