'Broad-based Trade and Investment Agreement (BTIA)' is sometimes seen in the news in the context of negotiations held between India and

1. A

   European Union

   The Broad-based Trade and Investment Agreement is the long-running proposed FTA-plus package negotiated between India and the European Union. News on BTIA refers to those talks. This option is the official key.

2. B

   Gulf Cooperation Council

   India–GCC talks have used other labels; BTIA in Indian usage is the EU track. This option is not the key.

3. C

   Organization for Economic Cooperation and Development

   OECD is not a customs union negotiating BTIA with India. This option is therefore wrong.

4. D

   Shanghai Cooperation Organization

   The Shanghai Cooperation Organisation is a security-political grouping, not the BTIA counterpart. This option is not the key.

Summary. Official key is (a) European Union. BTIA is the India–EU broad trade and investment negotiation launched in 2007 and often stalled over market access, data and procurement. GCC, OECD and SCO are different partners or forums. In Indian Prelims usage, BTIA means the EU. Only (a) is correct.