Due to Insufficient Exercise Endurance, a 15-Year-Old Kid Is Taken

Due to insufficient exercise endurance, a 15-year-old kid is taken to the clinic. He just begun weight lifting with pals but has struggled to complete the routines. According to the sufferer, his arms "feel like jello after just a few repetitions." He also experiences significant muscle cramps and sometimes urine staining following training sessions. Further testing showed that ingesting an oral glucose solution before commencing a demanding activity can significantly increase the patient's exercise tolerance. The vital signs are normal, and the exam is ordinary. Which of the following transformations is most likely catalyzed by this patient's deficiency in an enzyme?

A) A
B) B
C) C
D) D
E) E