A. planting the seeds of the plant with the desirable qualities
B. Crossing orange trees with those of desirable qualities
C. Applying special fertilizer to the other citrus trees
D. Grafting a branch from the tree with desirable qualities to the stock of other citrus trees
E. Planting the stem cuttings of the orange tree with desirable qualities
Correct Answer:
Option D – Grafting a branch from the tree with desirable qualities to the stock of other citrus trees