You have completed the initial assessment on a​ 2-year-old male patient who complains of the sudden onset of epigastric pain. His airway is​ patent, his breathing is fast but still​ adequate, and his radial pulse is weak and barely palpable with a delayed capillary refill. His pulse is 124​ beats/min and his skin is cool and moist to the touch. Your next action would be​ to:
A. Place the patient on the stretcher and move him to the ambulance
B. Perform a secondary assessment
C. Apply supplemental oxygen
D. Obtain a blood pressure in both arms