Spreaders are primarily utilized to:

Spreaders are primarily utilized to spread sand and/or de-icing materials, particularly in winter weather conditions when ice can pose significant hazards. These devices are designed to distribute materials evenly over a surface, which enhances traction and helps to melt ice on roads, runways, and other surfaces.

Utilizing a spreader allows for efficient coverage of large areas, ensuring that the materials are applied uniformly, which is critical for effective ice management and safety. This process aids in reducing slippery conditions and improving overall visibility and safety for vehicles and pedestrians during inclement weather.

The other options focus on different functions that do not align with the primary purpose of spreaders. For instance, while spreaders may be used indirectly in snow management, their main function is not to haul or cast snow, or to clean pavement surfaces, as those tasks are better handled by dedicated snow removal or cleaning equipment. Therefore, option C accurately reflects the main use of spreaders in managing snow and ice through the application of sand and de-icing substances.