Select the correct answer.

A geologist is passing through a canyon known for frequent flooding. He comes across a tall rock in the middle of the floodwater flow. The rock has softer minerals in the middle than at its sides. If the floodwater continues to rise, how will it affect the rock?

A. It will erode the rock from the sides, resulting in a mushroom shape.
B. It will deposit sediments on the rock and increase the size of its base.
C. It will erode the middle of the rock more than the outer edges.
D. It will erode the base of the rock until it breaks apart and the rock tips over.