The place where silage is commonly stored is called:

Silage is a type of fermented feed made from green foliage crops that are stored in a particular way to preserve their nutrients for livestock feeding. The most common structure used for this storage is a silo. Silos are specifically designed to handle the anaerobic fermentation process that occurs with silage, maintaining the ideal environment to keep the feed fresh and usable. They can be built as upright towers, horizontal bunkers, or silage bags, and their design plays a crucial role in preserving the moisture and avoiding spoilage.

The other options serve different purposes. A barn is an agricultural building used primarily for housing livestock or storing equipment and hay, while a shed is a smaller structure, often used for tool storage or equipment. A field refers to an area of land used for cultivation, and although silage is made from crops grown in fields, it is not a storage solution. Thus, the correct choice highlights the specific function and design requirements necessary for effective silage storage.