Concept:Cutting and layering depend on new roots forming from the planted part, so they work only for plants that can root easily.Explanation:Grafting and budding involve joining a scion or bud to an existing rootstock, so the cutting part does not need to root on its own.Layering and cutting require a stem or branch to develop adventitious roots before the new plant can survive independently.Thus, these two methods are limited to plants that produce roots readily.Answer:B. Layering and cutting