A Registered Nurse Is Teaching a Nursing Student the Relationship $\times$

A registered nurse is teaching a nursing student the relationship between cardiac output (CO) , blood pressure (BP) , and peripheral vascular resistances (PVR) . The student nurse is asked to recap the mathematical equation that relates the three factors. Which equation provided by the student nurse indicates the need for further teaching?

A) "CO $\times$ PVR = BP"
B) "CO / BP = PVR"
C) "BP / PVR = CO"
D) "PVR / CO = BP"