Wie viel Prozent der Zweitstimmen müssen Parteien mindestens bekommen, um in den Deutschen Bundestag gewählt zu werden?

Why this is the correct answer

To enter the Bundestag, a party must clear the five-percent threshold, meaning it needs at least 5% of all second votes cast nationwide. This rule prevents parliament from becoming fragmented by dozens of tiny parties, keeping the legislature functional. Parties that fall short of this barrier receive no seats from the proportional list.