You are answering a USMLE-style medical question. Question: A pulmonologist is analyzing the vital signs of patients with chronic obstructive pulmonary disease (COPD) who presented to an emergency room with respiratory distress and subsequently required intubation. The respiratory rates of 7 patients with COPD during their initial visit to the emergency room are shown: Patient 1 22 breaths per minute Patient 2 32 breaths per minute Patient 3 23 breaths per minute Patient 4 30 breaths per minute Patient 5 32 breaths per minute Patient 6 32 breaths per minute Patient 7 23 breaths per minute Which of the following is the mode of these respiratory rates?" Options: A) 30 breaths per minute B) 32 breaths per minute C) 10 breaths per minute D) 27.7 breaths per minute Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.