A Nursing Student Is Preparing a Poster of Various Theories

A nursing student is preparing a poster of various theories which are utilized in creating changes in the healthcare system. Which will best illustrate the systems theory?

A) School systems in two different counties each setting up their own independent afterschool exercise programs
B) Father being challenged to stop smoking because his daughter learned of the hazards of smoking from a smoke cessation program at her middle school
C) Hospital requiring all of its nurses to wear an identification badge while on duty
D) Healthcare provider in one state deciding to stop accepting Medicaid clients, while another healthcare provider in another state begins accepting Medicaid clients