Under what circumstances can seed labeling be exempted?

Seed labeling can be exempted under specific conditions where labeling is not required, which aligns with option B. The California Seed Law stipulates situations in which certain types of seeds do not need to be labeled, depending on factors such as the intended use of the seeds, their quantity, or their classification. For instance, seeds intended for research or experimental purposes may have different labeling requirements compared to those meant for commercial sale.

While seeds sold directly to consumers may have their own set of regulations, this does not inherently exempt them from labeling requirements. Large quantities of seeds could fall under specific regulations, but quantity alone does not guarantee exemption. Additionally, imported seeds have unique labeling requirements that may differ from domestic seed sales, meaning they aren't automatically exempt based on their origin. Thus, specific conditions govern which seeds can be exempted from labeling, making the correct answer clear in this context.