Why is the Deccan Trap associated with step like landforms?

Correct answer: Layers of successive lava flows were formed

The Deccan Trap was formed by repeated outpourings of basaltic lava over a large region. Each flow cooled and hardened into a layer. Later flows covered earlier ones, creating a thick, layered volcanic sequence. The different layers may weather and erode at different rates, so their edges can appear as a series of steps or terraces. This is why the landform is called a trap, a term associated with step-like terrain.

Option A is correct because successive lava flows are the basic geological structure behind the steps. Rivers depositing alluvium would produce depositional plains, not the characteristic layered volcanic plateau. Glacial moraines require glacier action, which is not the main origin of the Deccan Trap, and corals cannot explain this extensive basaltic formation. The essential link is repeated lava flows followed by differential erosion.