I believe it would be (B) but i’m sorry if i am wrong.
        
                    
             
        
        
        
The circulation of water in the ocean due to
differences in density between the different layers of water is most
likely responsible for "<span>B deep water ocean currents" The moon is responsible for the tides, and under water volcanoes will erupt regardless of the water density. 
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Answer:
The assimilation of the primary consumer is 5000 kcal/m2/yr, option C.
Explanation:
From the information in the question, the Net Production Efficiency, NPE can be calculated using 100Cp/AS.
Where CP is the consumer productivity and AS is the Assimilation.
Therefore, 20 = 100 x 1000/AS
AS = 100,000/20 = 5000 kcal/m2/yr. Option C.