The correct option is D A single party has been winning elections for five decades by using malpractices.
Denial of equal voting rights to religious or ethnic minorities is against democratic ideals. In a democracy, all citizens are equal, and each person's vote has the same value. Unfair elections and use of malpractices is a major challenge to democracy. In Mexico, the PRI won consecutive elections and ruled from 1929 to 2000 by using unfair practices.