c) Alaska

Alaska is home to the highest number of active volcanoes in the United States, with over 130 volcanoes and volcanic fields active within the last two million years. Many of these volcanoes are part of the Aleutian Arc and the Alaska Peninsula. The state’s volcanic activity is due to its location on the Pacific Ring of Fire, where tectonic plates meet and create conditions for frequent seismic and volcanic activity. Alaska’s volcanoes pose significant challenges to air travel, as ash clouds can disrupt flights, but they also contribute to the state’s stunning natural beauty and geological diversity.