The physical process that formed the landform along the northeastern border of India is the collision of tectonic plates. Option D is correct.
What is tectonic plates?
Plate tectonics is a widely held scientific theory that the Earth's earth's crust is made up of a number of big and massive tectonic plates that have been slowly moving since around 3.4 billion years old.
The collision of tectonic plates is the physical process that created the landform along India's northeastern border.
Therefore, option D is correct.
Learn more about the tectonic plates, refer to:
https://brainly.com/question/16944828
