Answer: b. turbidity currents deposit sediments on the ocean floor.
Abyssal plains are flat land forms found in the lower depth of the oceans. The flat seafloor forms by the deposition of the thin blanket of muddy sediments, that sinks at the bottom of the ocean. These sediments covers the volcanic rocks of the oceanic crusts. These muddy sediments are brought below the sea floor by the turbid water currents.
