The formation of block mountains are best associated with

Block mountains, also known as fault-block mountains, are formed by the uplifting of a section of the Earth's crust along a fault line. As the Earth's tectonic plates move and shift, the rocks on either side of a fault can be pushed up, creating a mountain range. The correct option that best describes the formation of block mountains is the uplifting of crustal block within two parallel faults. When there is tension in the Earth's crust, it can cause two parallel faults to move away from each other, pulling a block of rock upwards in between them. Over time, erosion can wear away the softer rock layers, leaving behind steep-sided mountains or ridges made of harder, more resistant rock formations. Accumulation of materials ejected from within the Earth's crust, solidification of magma within the Earth's crust, and vertical movement of sediments into geosynclines are associated with the formation of other types of mountains, but not block mountains.