Excluding Hawaii, where are most of the volcanoes in the United States located?

along North America's Atlantic coast, near the center of tectonic plates
along North America's Pacific coast, near the center of tectonic plates
along North America's Atlantic coast, near the boundaries of tectonic plates
along North America's Pacific coast, near the boundaries of tectonic plates

Most of the volcanoes in the United States, excluding Hawaii, are located along North America's Pacific coast, near the boundaries of tectonic plates.