Why are Western ragweed plants beneficial for wildlife?

Western ragweed plants are particularly beneficial for wildlife primarily because they offer high-quality seeds for food. These seeds are a valuable food source for a variety of birds and small mammals, especially during the fall and winter months when other food sources may be scarce. The seeds are rich in energy and nutrients, making them an important element of the diet for many species.

Additionally, while Western ragweed does have other benefits, such as attracting nectar-feeding insects, that role is often less significant in terms of direct food provision for larger wildlife. The plant's ability to provide shade or deter harmful pests may contribute to the ecosystem in various ways; however, these aspects do not directly impact the food sources available to wildlife in the same way that its seeds do. Thus, the high-quality seeds produced by Western ragweed play a crucial role in supporting the food web in their habitats, making option C the best answer regarding their specific benefit to wildlife.