The fault blocks with sharp features are known as ________.
A.Folds
B.Mountains
C.Horsts
D.Rift valley

Hint:It is a raised fault block. It lies between two normal faults. The Vosges Mountains of France and the Palestine Plateau are good examples of it.

Complete answer:
Fault blocks are large blocks of rock which are formed due to tectonic and localized tensions in Earth's crust.
When the Earth's crust is raised together via compression forces, it can undergo geological processes called folding and faulting. Folds occur when the Earth's crust bends away from a flat surface. This option is incorrect.
A mountain is a large landform that is formed through tectonic forces or volcanism. It rises above the surrounding land in a limited area forming a peak. This option is incorrect.
A horst is an elevated fault block which is bounded by normal faults. It is formed when a part of the Earth's crust is lifted or has remained stationary, while the land on either side has subsided. It has sharp features. This option is correct.
A rift valley is formed on a divergent plate boundary, created by the action of a geologic fault. Examples: Baikal Rift Valley in Russia and the Rhine Rift Valley in Germany. This option is incorrect.

Hence, option C is the right answer.

Note:The Midcontinent Rift System in North America is marked by a series of horsts extending from Lake Superior to Kansas.
In many rift basins around the world, the enormous discovered hydrocarbons are found in conventional traps related to horsts. For example, petroleum found in the Sirte Basin, Libya is found on the Zelten Platform, which is a large fault block.