The Citric Acid cycle itself can be divided into three stages called Pyruvate transport, CO₂ emission stage, and the oxaloacetate reformation stage. Where would you draw the line dividing the three stages and why?

a) After Pyruvate transport; Pyruvate enters the cycle
b) After CO₂ emission stage; carbon dioxide is released
c) After the oxaloacetate reformation stage; oxaloacetate is regenerated
d) After the first complete rotation of the cycle; a new cycle begins