The correct answer is: B. Pipe pile
Pipe piles are hollow steel tubes that are driven into the ground. They are often used in soft clay or loose sand because they have a large surface area that allows them to distribute the load over a wider area. This makes them more stable in these types of soil.
H-piles are solid steel beams that are also driven into the ground. They are often used in hard clay or dense sand because they are very strong and can support a lot of weight. However, they are not as good at distributing the load as pipe piles, so they are not as stable in soft soils.
Screw piles are helical steel shafts that are screwed into the ground. They are often used in soft soils because they can be easily installed and they have a large surface area that allows them to distribute the load over a wide area. However, they are not as strong as H-piles or pipe piles, so they are not used in heavy-duty applications.
Disc piles are large, flat plates that are driven into the ground. They are often used in soft soils because they have a large surface area that allows them to distribute the load over a wide area. However, they are not as strong as H-piles or pipe piles, so they are not used in heavy-duty applications.