Count first, then distinguish the political roles.
A parliamentary group brings MPs together. Its strength can be compared by membership. The official current seat distribution is more suitable for this than an older election-night chart.
CDU and CSU are two parties but form a joint Bundestag group. This question therefore counts them together as CDU/CSU.
The other three answers
Compare both names in each answer with the current ranking.
The Left and Alliance 90/The Greens.
The Left and Alliance 90/The Greens have 64 and 85 seats respectively in the checked figures. Both are smaller than CDU/CSU and AfD.
Alliance 90/The Greens and SPD.
The Greens have 85 seats and SPD 120. This pair does not contain the two largest groups.
The Left and CDU/CSU.
CDU/CSU is the largest group, but The Left is not the second largest. A pair that is only half correct is still incorrect.
Election results and current group membership can differ.
MPs may leave or change groups. These are therefore the group counts visible on the review date, rather than uncritically copied figures from the 2025 election result.
Non-attached MPs remain members of parliament. Being the “largest group” also does not automatically mean holding an absolute majority of all seats.
21st term · checked 19 October 2026 · German Bundestag ↗Currently checked: CDU/CSU first, AfD second.
Group size, participation in government and absolute majority are three different claims.
Three words for this question
- die Fraktionsstärkegroup size
- The number of MPs in a parliamentary group.
- fraktionslosnon-attached
- Holding a parliamentary seat without membership of a group.
- die Koalitioncoalition
- Cooperation between parties to form a government.