Concept:Features formed by cooling and solidification of magma within the earth's crust are known as intrusive igneous landforms.
Explanation:Magma is molten rock beneath the earth's surface.
When it intrudes into the crust and solidifies before reaching the surface, the resulting feature is called an intrusive igneous body.
A laccolith is a lens-shaped or dome-shaped intrusive body that forms when thick, viscous magma cools in the upper crust, often pushing the overlying strata into a dome.
In contrast, cinder cones, composite cones, and lava plateaus are extrusive volcanic features created by volcanic materials and lava spreading at the earth's surface.
Since the question emphasizes cooling and solidification within the crust, the correct feature is the laccolith.
Answer:C. Laccolith