Great Britain is not a country. "Great Britain" describes the combination of England, Scotland, and Wales. In order to qualify for the Olympics it has to be a country.
Group A: Cote D'Ivoire (A1), Argentina (A2), Australia (A3), Serbia (A4)
Group B: Netherlands (B1), Nigeria (B2), Japan (B3), USA (B4)
Group C: China (C1), New Zealand (C2), Brazil (C3), Belgium (C4)
Group D: Republic of Korea (D1), Cameroon (D2), Honduras (D3), Italy (D4)
These are the qualifying countries for the Olympics.