You are answering a USMLE-style medical question. Question: A 56-year-old man comes to the physician for a follow-up examination 1 week after a temporal artery biopsy was performed to evaluate headache and blurry vision. He has a 12-year history of hypertension treated with lisinopril. Results of the testing show decreased concentrations of arginine in vascular endothelial cells. Which of the following is the most likely explanation for this finding? Options: A) Increased binding of calcium to calmodulin B) Increased phosphorylation of myosin C) Increased production of nitric oxide D) Decreased concentration of bradykinin Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.