Which method of propagation uses techniques like grafting and tissue culture?

B is the correct choice because it refers to asexual propagation, which encompasses techniques that do not involve the formation of seeds. Asexual propagation allows plants to reproduce without sexual reproduction processes, leading to offspring that are genetically identical to the parent plant.

Methods such as grafting, where tissues from two different plants are joined together, and tissue culture, which involves growing new plants from cell cultures, are key strategies in asexual propagation. These methods enable the successful multiplication of desirable plant traits and faster production of new plants, especially in horticulture and agriculture.

In contrast, seed propagation involves growing plants from seeds, which is a form of sexual reproduction. Natural propagation refers to the ways plants reproduce in their environments without human intervention, while sexual propagation specifically refers to the process of producing seeds through the fertilization of the ovule by pollen. These methods do not involve grafting or tissue culture, making them distinct from asexual propagation techniques.