Discussion
Ocean basin is a vast area of the ocean floor that lies deeper than ....... meters.
Answer: D
The key is 2000 metres.
The continental shelf ends at about 200 m and the continental slope falls away beyond it. The ocean basin proper, the deep floor with its abyssal plains, ridges and trenches, begins beyond the slope. Of the four values, 500, 800 and 1000 m are all still on the shelf or upper slope, while 2000 m is the only one that can mark the start of the deep floor.
The figure of 2000 m itself could not be confirmed in a reference. Books give different depths for where the basin begins, and the question's wording follows one textbook line. Answer D by elimination and by the key.
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