What does the abbreviation SPD stand for?

EDITORIAL LEARNING AID

Why is this answer correct?

SPD stands for Social Democratic Party of Germany; it is Germany's oldest party and was part of the federal government from 2021 to 2025. The forms in a, b and d are incorrect and not official party names.

SPD: Social Democratic Party of Germany, Germany's oldest party.

This translation and explanation are editorial learning aids. The official German wording and answer key govern the examination.