Concept:A horst is a raised block of Earth’s crust bounded by faults, formed by tectonic uplift.
Explanation:A horst is created when a central block of land is pushed upward while the blocks on either side sink along parallel faults.
This process is associated with faulting, not with volcanic eruptions, erosion, or folding.
Block mountains, such as the Vosges and the Black Forest, are formed by such faulting and include horsts as their main raised feature.
Therefore, a horst is a characteristic relief feature of a block mountain.
Answer:C. block mountain