Step 1: Understand the "World Book Capital" designation.
Every year, UNESCO designates a city as the World Book Capital. The chosen city commits to promoting books and reading for a one-year period, starting on World Book and Copyright Day (April 23rd).
Step 2: Identify the city for the specified year (2026).
UNESCO officially announced that Rio de Janeiro, Brazil, will be the World Book Capital for the year 2026. This was a correction as the designation was initially for 2025 but was moved to 2026.
Step 3: Know the cities for other years for context.
2023: Accra, Ghana
2024: Strasbourg, France
2025: This designation was shifted.
2026: Rio de Janeiro, Brazil
Based on the official UNESCO designation for 2026, Rio de Janeiro is the correct answer.