If You Are Trying to Alter the Defensive Mechanisms of a Plant,which

If you are trying to alter the defensive mechanisms of a plant,which component of the signal transduction pathway would be the ideal place to do this?

A) Alter the receptor molecule on the plasma membrane,cytoplasm,or nucleus.
B) Block the relay proteins within the cytoplasm that will convert the signal.
C) Change the gene expression or the cellular process that affects the plants growth.
D) All of these would alter the defensive mechanisms of the plant.