| [ A ]    Beaufort scale | |
| [ B ] Richter scale |  | 
| [ C ] Secant scale | |
| [ D ] Mercalli scale | 
| [ A ]    Beaufort scale | |
| [ B ] Richter scale |  | 
| [ C ] Secant scale | |
| [ D ] Mercalli scale | 
| Answer : Option B | 
| Explanation : | 
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