The correct answer is small hill.
B. small hill
The correct answer is (B) small hill; mound; small rounded eminence.
Knoll comes from Old English cnoll (hilltop), Dutch knoll, Middle High German knolle (clod), Norwegian knoll (hillock).
Examples of use:
- Their quarry lay hidden behind a knoll.
- A knoll of lawn rose beyond the back of the building.