the side veneer graft is the most effective way to propagate the ______. \n a. blue colorado spruce \n b…

Brief Explanations:

To determine the answer, we recall that side veneer grafting is commonly used for propagating tree peonies. Blue Colorado spruce is often propagated by other methods like cuttings or seeds, while apple and cherry are typically propagated via budding or other grafting methods more suited to them, but tree peony is known to be effectively propagated by side veneer grafting.

Answer:

c. tree peony