A 20-Year-Old Man Arrives to the Emergency Department Complaining of Lethargy

A 20-year-old man arrives to the emergency department complaining of lethargy, malaise, and black urine. Several days earlier, the patient was treated for a bacterial skin infection. Scleral icterus is discovered during a physical examination. Anemia with an increased reticulocyte count is revealed by laboratory findings. On a peripheral smear, abnormal erythrocytes might be observed. Which of the following substrate flow routes in this patient is most likely deficient?

A) A
B) B
C) C
D) D
E) E
F) F
G) G