The Central Uplift in a Complex Crater Is Formed

The central uplift in a complex crater is formed:

A) when fractured walls fall into the centre,creating a hill in the middle of the crater.
B) after impact when the melted material and uplifted debris settle down into the middle of the crater.
C) when the rock beneath the crater rebounds,causing the centre of the floor to rise.
D) when an impact causes such a high temperature only at the periphery of the crater,so the centre of the crater stays stable while the material beside the walls is liquefied and vaporized.
E) when earth material washed from the steep crater walls is deposited at the central area of the crater.