Which of the following country is not a member of G-8?

China is not included in the G-8 group, which has now transformed into G-7. G-8 was a political group of industrialized countries: Canada, France, Germany, Italy, Japan, the UK, and the US; with Russia included as the eighth member from 1997 to 2014. China has not been included as a member of G-8; however, China has joined some of the meetings of G-8 as a guest member or under G8+5.