A nurse is reinforcing teaching to a client who has restrictive cardiomyopathy (RCM). Which of the following statements should the nurse include in the client teaching to explain the cause of RCM?

"Your heart condition is caused by thickening of the ventricular walls and septum."

"Your heart condition is caused by excessive stretching of the ventricles."

"Your heart condition is caused when the ventricular tissue becomes fibrous and fatty."

"Your heart condition is caused from stiffening of the walls of the ventricles."