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                              Q:
                           
                           
                                                      | A) If 'A' is the effect and 'B' is its immediate and principal cause. | B) If 'A' is the immediate and principal cause and 'B' is its effect. | 
| C) Both A and B | D) None of these | 
                              Answer:   D) None of these 
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
Both are independent events.
 
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