The correct answer is option 2: United States of America. Mount St. Helens is an active strato volcano situated in Washington state, United States. It is part of the Cascade Range, which is a chain of volcanic mountains that stretches from Northern California to Canada. Mount St. Helens is most famous for its catastrophic eruption on May 18, 1980, when it lost its summit in a powerful blast that caused widespread destruction and loss of life. This event is considered one of the most significant volcanic eruptions in the history of the United States. Therefore, it is crucial to associate Mount St. Helens with the correct location, which is the United States of America.