Party of the Democratic Revolution is Mexico's main left-of-center opposition party.

• A. PRD
• B. PRI
• C. PAN
• D. MORENA

Answer: (A)

The main idea here is identifying who has historically stood as Mexico’s primary left-of-center opposition. The Party of the Democratic Revolution (PRD) fits that role because it formed in 1989 as a broad coalition of left-wing groups and PRI dissidents, positioning itself clearly to the left of center. It became the principal vehicle for those seeking an alternative to the long-governing PRI, leading the opposition throughout much of the 1990s and into the 2000s.

Although the political landscape has shifted in recent years—with MORENA rising as the dominant left-wing party and the ruling force since 2018—the PRD is the classic example of the main left-of-center opposition in Mexico during the period many questions target. The other parties are not characterized as the main left-of-center opposition: PRI was the long-time governing party, PAN is center-right, and MORENA, while leftist, became the governing party rather than the principal opposition in the period most associated with this description.