Question

mountains form from...
collision of plates
plates sliding past one another
plates moving away from each other

Explanation:

According to the theory of plate tectonics, mountains mainly form from the collision of tectonic plates. When two continental plates collide, the crust is compressed and forced upward, creating mountain ranges. Plate sliding past one another (transform boundaries) typically causes earthquakes rather than mountain formation. Plates moving away from each other (divergent boundaries) usually lead to the formation of rift valleys or mid - ocean ridges, not large mountain ranges on continents.

Answer:

collision of plates