Which country is not a member of Group Eight (G-8)?

India

The correct answer is Option (3) - India

India is not a member of the Group of Eight (G-8).

The International Monetary Fund (IMF) is an international organisation that oversees those financial institutions and regulations that act at the international level. The IMF has 190 member countries (as on 19 Febuary 2024) but they do not enjoy an equal say. The G-7 members US (16.52%), Japan (6.15%), Germany (5.32%), France (4.03%), UK (4.03%), Italy (3.02%) and Canada (2.22%) have 41.29% of the votes. China (6.09%), India (2.64%), Russia (2.59%) Brazil (2.22%) and Saudi Arabia (2.02%) are the other major members.

More information about G8:

The G-8 held annual summits where leaders of member countries gathered to address pressing global challenges, such as economic stability, trade, climate change, and security issues. The meetings provided an opportunity for leaders to exchange views, coordinate policies, and sometimes make joint commitments to address common concerns.
In 2014, following Russia's annexation of Crimea, the other G-7 countries decided to suspend Russia's participation in the group, effectively reverting it to the G-7. Since then, the G-7 has continued to meet annually, focusing on similar issues as the G-8 but without Russia's participation.

The G-8 consisted of:

Canada
France
Germany
Italy
Japan
Russia (expelled in 2014)
United Kingdom
United States
India participated in some G-8 summits as a guest but wasn't a formal member