The correct answer is C. Friction bearing pile.
A friction pile is a type of pile that supports the load by friction between the pile and the soil. The pile is driven into the ground until it reaches a hard stratum, and then the load is applied to the top of the pile. The friction between the pile and the soil resists the load, and the pile transfers the load to the hard stratum.
A bearing pile is a type of pile that supports the load by bearing on a hard stratum. The pile is driven into the ground until it reaches a hard stratum, and then the load is applied to the top of the pile. The hard stratum supports the load, and the pile transfers the load to the hard stratum.
A friction bearing pile is a type of pile that supports the load partly by friction and partly by bearing on a hard stratum. The pile is driven into the ground until it reaches a hard stratum, and then the load is applied to the top of the pile. The friction between the pile and the soil resists part of the load, and the hard stratum supports the other part of the load.
A rough pile is a type of pile that has a rough surface. The rough surface increases the friction between the pile and the soil, which increases the load that the pile can support.