The correct answer is: B. Pedestal pile
A pedestal pile is a type of pile that has a cast iron shoe at the bottom. The shoe is designed to distribute the load of the structure over a larger area, which helps to prevent the pile from sinking into the ground. The hollow cylindrical steel casing is used to protect the pile from the surrounding soil and to provide a smooth surface for the concrete to be poured into. Once the concrete has cured, the casing is removed, leaving the cast iron shoe in place.
A simplex pile is a type of pile that does not have a cast iron shoe. The pile is made of a single piece of steel and is driven into the ground by a hammer. The simplex pile is not as common as the pedestal pile, but it is still used in some applications.
A vibro pile is a type of pile that is driven into the ground by a vibrator. The vibrator helps to loosen the soil and makes it easier for the pile to be driven into the ground. The vibro pile is not as common as the pedestal pile or the simplex pile, but it is still used in some applications.
In conclusion, the correct answer is: B. Pedestal pile.