The Government of National Capital Territory of Delhi (Amendment) Bill, 2021, which was passed in March 2021 amended the Government of National Capital Territory of Delhi Act, ______.

The correct answer is 1991.

The Government of National Capital Territory of Delhi (Amendment) Bill, 2021 amended the Government of National Capital Territory of Delhi Act, 1991.

Let us understand this step by step:

Step 1 – Background of the Original Act:
The Government of National Capital Territory of Delhi Act, 1991 was enacted by the Parliament of India to give effect to the provisions of Article 239AA of the Indian Constitution, which was inserted by the 69th Constitutional Amendment Act, 1991. This Act laid down the legislative and executive framework for the governance of the National Capital Territory (NCT) of Delhi, defining the roles and powers of the elected Government (Council of Ministers headed by the Chief Minister) and the Lieutenant Governor (LG) appointed by the President of India.

Step 2 – Why the Amendment was needed:
Over the years, there had been persistent ambiguity and friction between the elected Government of Delhi and the Lieutenant Governor regarding who held supreme executive authority. A series of court judgments — including a significant Supreme Court ruling in 2018 — had tried to clarify the division of powers. However, the need for a legislative fix was felt to provide statutory clarity.

Step 3 – What the Amendment Bill, 2021 did:
The Government of NCT of Delhi (Amendment) Bill, 2021 was introduced in the Lok Sabha and passed in March 2021. It amended the original Government of National Capital Territory of Delhi Act, 1991 by making the following key changes:

• It clarified that the term "Government" referred to in any law made by the Delhi Legislative Assembly shall mean the Lieutenant Governor (LG).
• It required the Council of Ministers or any individual Minister to mandatorily obtain the opinion of the LG before taking any executive action.
• It barred the Delhi Legislative Assembly and its committees from making rules that enabled them to consider the matters of the day-to-day administration of the NCT or conduct inquiries in relation to administrative decisions.

Step 4 – Elimination of other options:
• 1994 – Not relevant; no foundational Delhi governance act was passed in this year.
• 1996 – Not relevant to the original Delhi governance legislation.
• 1998 – Not relevant; no major constitutional or statutory base for Delhi's governance structure was established in this year.

Conclusion:
The Government of National Capital Territory of Delhi (Amendment) Bill, 2021 specifically amended the Government of National Capital Territory of Delhi Act, 1991, which is the parent legislation governing the unique constitutional status of Delhi as a Union Territory with a Legislative Assembly.