The correct option is A scion
Grafting
Grafting is a method of vegetative propagation in plants in which the root system and shoot system of two different plants are joined together to form a composite plant. The scion is grafted onto the stock for this purpose.
Scion
Scion is the part of the plant having a young shoot or bud that is grafted onto the root bearing stock. Scion is selected for good quality of fruits, flowers etc. Hence it is responsible for the flavour,aroma,texture and ripening of fruit.
Stock
Stock is a part of the plant having a strong root system. It is chosen in the grafting process for its adaptability and disease tolerance.
Final answer: (b)