Final answer:
Volcanoes, island arcs, and mountains are formed at convergent plate boundaries with subduction zones. Plate 2 is the site where this activity would result.
Step-by-step explanation:
The activity that would result in volcanoes, island arcs, and mountains is associated with Plate 2. Plate tectonics is the scientific theory that explains the movements and interactions of Earth's lithospheric plates. Volcanoes can form at convergent plate boundaries where one plate dives beneath another. Island arcs, such as the Japanese archipelago, form from volcanic activity in these subduction zones. Mountains can also occur at these boundaries due to the compression and folding of rock layers.
Learn more about Plate tectonics