The correct option is D Stem layering
Stem layering is done in grape vines, citrus, and jasmine. Here, a new plant can be propagated by bending the lowest branch of the plant into the ground and covering it with soil in such a way that tip of the branch would be exposed to the sunlight. This segment will soon begin sprouting its own independent root system while still being nourished by the connecting plant. Once it gets maturity, this segment is detached from the plant and survive as an individual.
Thus, the correct answer is option A.