The Himalayas are the highest mountains in the world. How does the theory of plate tectonics help explain the location and size of the Himalayan mountains?

A. they formed along a boundary where two continental plates collide and push the land upwards
B. they formed along a ridge where tectonic activity produces volcanoes would erupt and grow taller
C. they formed where two plates pull apart and produce new crust which increases the elevation of the old crust.
D. they formed where one plate is moving under another plate and sea level drops which makes the mountains taller.