Concept:A laccolith is a dome-shaped igneous intrusion formed when thick acidic lava pushes up overlying sedimentary rock.
Explanation:Thick acid lava is highly viscous due to its high silica content.
It rises through the crust and gets injected between sedimentary rock layers.
Because it is too thick to spread easily, it exerts strong upward pressure.
This pressure forces the overlying sedimentary layers to bulge upward into a dome.
The lava then cools and solidifies slowly underground.
The resulting rock body has a flat floor and a domed roof, which is a laccolith.
In contrast, a batholith is a large irregular deep intrusion.
A dyke cuts vertically across rock layers.
A lopolith is a concave, basin-shaped intrusion.
Thus, the feature described in the question is a laccolith.
Answer:B. laccolith