Wenn das Parlament eines deutschen Bundeslandes gewählt wird, nennt man das …

Why this is the correct answer

When voters in a German federal state go to the polls to elect their state parliament (Landtag), that election is called a Landtagswahl. This is separate from a Bundestagswahl (federal election), a Kommunalwahl (local election), or a Europawahl (European Parliament election), each of which elects a different level of representation.