What activities are included in the "work of preparing the coal"?

The correct choice encompasses a comprehensive range of activities involved in the preparation of coal. This involves breaking the coal into manageable sizes, crushing it to reduce its bulk and improve handling, and sizing it to achieve the desired dimensions for various uses. Cleaning is also vital as it removes impurities, ensuring that the coal meets quality standards for end-users. Additionally, associated processes might include screening, washing, and further refinement steps that enhance the coal's marketability and functionality. This approach reflects the complexity of coal preparation, where multiple interconnected tasks work together to optimize the quality and suitability of the coal for consumption in power generation, steel production, or other applications.