Final answer:
The correct term for a hill that stands apart and is far removed from other hills is 'isolated hill'.
Step-by-step explanation:
The question asks for the correct term for a hill which stands apart and is far removed from other hills. The correct term to fill in the blank is (c) isolated hill. An isolated hill is a hill that stands alone in a plain or comparatively level area, with no surrounding hills. It is important to note that a conical hill refers to the shape of the hill, round top hill describes the contour of the hill, and knoll is a term for a small hill or mound, any of which could potentially be isolated, but 'isolated' specifically refers to the positioning relative to other hills.