Indian Constitution

Step 1: Understanding the RTI Act.
The Right to Information (RTI) Act is a significant legislation in India that empowers citizens to seek information from public authorities. It promotes transparency and accountability in the working of the government.

Step 2: Historical Background.
The RTI Act was passed by the Indian Parliament on 15 June 2005. Later, it came into full effect on 12 October 2005.

Step 3: Analysis of the options.

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  (A) 15 June 2005: Correct. This is the official date when the Act was passed by Parliament.
• 
  (B) 20 June 2005: Incorrect. This is not the correct passing date.
• 
  (C) 30 July 2007: Incorrect. This date does not relate to the passing of the Act.
• 
  (D) 1 April 2004: Incorrect. The Act was not passed in 2004.

Step 4: Conclusion.
Therefore, the Right to Information Act was passed on 15 June 2005.

Final Answer:} 15 June 2005.