Which of the Following Statements About Political Party Competition in Germany

Which of the following statements about political party competition in Germany is accurate?

A) The SPD is considered a catchall party; the center-right CDU/CSU is considered more exclusionary.
B) Germany's historically dominant parties reached their highest proportion of the vote in the 2013 general elections.
C) Angela Merkel has only been able to rule since 2013 through a coalition with the Free Democratic Party.
D) Parties must reach 5 percent of the electoral vote in order to hold seats in the legislature.