The correct sequence in Krebs cycle is
A. Oxaloacetic acid `to alpha`-ketoglutaric acid `to` Isocitric acid
B. Oxaloacetic acid `to` Isocitric acid `to alpha`-ketoglutaric acid
C. `alpha` ketoglutaric acid `to ` Isocitric acid `to` Oxaloacetic acid
D. Isocitric acid `to alpha` ketoglutaric acid `to` Oxaloacetic acid