The statement that best explains why Alaska, Hawaii, and the West Coast are home to most of the volcanoes in the United States is:
C These areas are located on tectonic plate boundaries or oceanic hotspots.
This option accurately describes the geological activity associated with volcanoes, as these regions are indeed associated with the movement of tectonic plates, which can lead to volcanic activity either at plate boundaries (such as subduction zones) or at hotspots (such as Hawaii).