Concept:High-fibre animal feeds come mainly from forage crops, not from grains or protein seeds.Explanation:Silage is made by fermenting green forage crops such as grass or maize plants.Forage plants have large amounts of structural carbohydrates like cellulose, making silage high in fibre.Maize grain, wheat grain, and soybean are more concentrated in energy or protein and contain less fibre than silage.Answer:B. silage.