Which French reality adventure competition, based on the international Survivor format, strands contestants on a deserted island and has aired since 2001?

• A Fort Boyard
• B Koh-Lanta ✓
• C Pekin Express
• D Les Aventuriers

Koh-Lanta, presented by Denis Brogniart, is one of the most-watched programmes on French television, with contestants competing in physical and strategic challenges.