A dry-bulk cargo trailer is characterized by carrying which of the following?

A dry-bulk cargo trailer is specifically designed for transporting bulk dry materials, which can include various types of solids. One of the common uses for these trailers is to carry corrosive solids, such as certain chemicals, as well as fertilizers that are often in granular form. These materials need to be transported in a way that prevents moisture infiltration and allows for efficient unloading.

The other options relate to other forms of cargo that do not suit the characteristics of a dry-bulk trailer. For instance, compressed gases at high pressure are typically carried in gas cylinders or specialized tanks designed for such pressure levels, not dry-bulk trailers. Liquid products are carried in liquid tankers, which are specifically designed to handle the unique pressures and containment needs of liquids. Foodstuffs and perishable goods usually require refrigerated or temperature-controlled transport to prevent spoilage, which is also unsuitable for a dry-bulk configuration.

Thus, option B reflects the correct nature of materials transported in a dry-bulk cargo trailer.