The correct option is B Vegetative propagation is a faster mechanism of reproduction as compared to sexual reproduction.
Asexual reproduction doesn't involve the fusion of gametes. Thus there can be no variation in the offsprings produced by vegetative propagation.
Vegetative propagation is not seen in animals. It is exclusive to plants.
Layering is not a type of natural vegetative propagation. It is a type of artificial propagation since it cannot occur naturally and requires human interference.
It is true that vegetative propagation is a faster mechanism of reproduction as compared to sexual reproduction. This is because it doesn’t require waiting for the development of the sexual organs of the plant. Also, a stem or a bud grows into a mature plant much more quickly as compared to a seed which has to go through a longer phase of growth and development.