Ecuador is the correct answer. The Tungurahua Volcano, whose name translates to "Throat of Fire" in the indigenous Quichua language, is a highly active stratovolcano located in the Cordillera Oriental of the central Andes in Ecuador. In April 2025, the volcano and its surrounding territory were officially designated as a UNESCO Global Geopark. The newly designated geopark spans over 2,300 square kilometers across the Tungurahua and Chimborazo provinces, preserving over 417 million years of geological history, including volcanic formations and glacial activity. It sits within Sangay National Park and towers over the town of Baños de Agua Santa.

Peru, Bolivia, and Colombia are incorrect. While these are all South American nations that share the Andes mountain range and possess their own significant volcanic peaks (such as Nevado del Ruiz in Colombia or Ubinas in Peru), the Tungurahua Volcano is located exclusively within the borders of Ecuador.

Therefore, the correct option is A.