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                |  | Cropping intensity means: |  
                | | [A]. | Percentage ratio of gross cropped area to net cropped area | [B]. | Percentage ratio of net-cropped area to gross cropped area |  | [C]. | Percentage ratio of the number of crops in rotation to period of one rotation | [D]. | Percentage ratio of gross cropped area to the net-cropped area | 
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                | ziaullah said: |  |  |  |  
                | what is the difference between option a and d. |  
 
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