an ancient river flooded an earthquake folded land tectonic plates pulled apart tectonic plates collided
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which best explains how the Appalachian Mountains formed?
Possibilities:
- an ancient river flooded
- an earthquake folded land
- tectonic plates pulled apart
- tectonic plates collided

tectonic plates collided