Refer to the numbered steps in the figure when answering the question. Two carbons in the form of acetyl- CoA enter the Krebs cycle by joining with oxaloacetic acid, a 4- carbon molecule. During which step does carbon leave the Krebs cycle in the form of CO2? 
A) step 1
B) step 3
C) step 4
D) step 1 and step 3 and step 4
E) step 3 and step 4
Correct Answer:
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