What is the name of the isthmus at the narrowest point of the country, separating the Gulf from the Pacific Ocean, historically considered as a potential alternative to the Panama Canal?

• A Isthmus of Tehuantepec ✓
• B Isthmus of Darien
• C Isthmus of Corinth
• D Isthmus of Kra

The Isthmus of Tehuantepec is only about 200 km wide and has been used for centuries as an interoceanic trade corridor, now being developed as a trans-isthmus railway.