Final answer:
The feature that separates the slope from the ocean floor is the continental rise. It is composed of sediments that move down from the continental shelf and slope, forming a gentle slope that transitions into the ocean floor. Option b. is correct.
Step-by-step explanation:
The feature that separates the slope from the ocean floor and is made of large amounts of sediments is known as the continental rise. The continental rise extends from the end of the continental slope and is typically found where there is an accumulation of sediment that moves down from the continental shelf and slope. The sediment is deposited here, and this area can be characterized by thick sequences of deposited materials forming a gentle slope connecting the ocean floor with the continent.
The continental shelf is the submerged portion of a continent's crust in relatively shallow water. This shelf extends from the shoreline to the edge of the continent and is generally less than 180 m (600 ft) in water depth. During a lowstand, an interval of time when relative sea level is low, the continental shelf is exposed, and sediments are more likely to be transported into deep marine basins.
The continental shelf and slope play vital roles in oceanography as they provide the regions where sediments from land are deposited into the ocean, which can include a variety of bed forms such as ripples and sand ridges due to the interaction with ocean currents and waves. The transition from the continental slope to the deeper ocean floor involves the continental rise, which accommodates the sediments shedding off the continental shelf.