 
			 
			MCQOPTIONS
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				| 1. | The driving force for grain growth is _________ | 
| A. | the stored energy of cold working | 
| B. | the decrease in the grain area energy | 
| C. | the decrease in the point defect energy | 
| D. | the thermal energy of heating | 
| Answer» C. the decrease in the point defect energy | |