MCQOPTIONS
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				| 1. | 
                                    Coalification means the | 
                            
| A. | process of conversion of lignite into anthracite. | 
| B. | underground gasification of coal. | 
| C. | complete combustion of coal. | 
| D. | direct hydrogenation of coal. | 
| Answer» B. underground gasification of coal. | |