What is required for normal perfusion to occur?

A) Airway patency, proper amounts of carbon dioxide, and adequate glucose levels
B) Adequate breathing, sufficient numbers of red blood cells, and sufficient heart function
C) Intact breathing, an ample number of red blood cells, and body temperature of 98.6°F
D) Patent airway, sufficient breathing, high amounts of glucose, and good heart function

B) Adequate breathing, sufficient numbers of red blood cells, and sufficient heart function