Answer:
The Amazon is the world's longest river.
Looking at the positions of most if not all volcanoes, earthquakes, and major mountain belts, they are distributed mainly around the tectonic plate boundaries.
This is because the boundaries push further away, move closer together, and slide against each other (convergent, divergent, transform), thus creating either mountains, volcanoes, or earthquakes.
The answer would be A, for the exact reason it gives you
Plate Tectonics, that would be the answer <span />