Here's why:

* Formation: Jebel Hafeet was formed by the collision of the Arabian and Eurasian tectonic plates. This collision caused the Earth's crust to buckle and fold, creating the mountain range.

* Structure: Folded mountains are characterized by layers of rock that have been bent and warped by tectonic forces. Jebel Hafeet exhibits these folded structures, with layers of sedimentary rock dipping at various angles.

* Fault Lines: While fault lines are present in the region, they are not the primary factor in the formation of Jebel Hafeet. Fault lines are fractures in the Earth's crust where rocks have moved past each other, often creating cliffs and scarps.

Therefore, the folding of rock layers, caused by tectonic forces, is the dominant factor in the formation of Jebel Hafeet.