You witness an adult collapse in a shopping centre. He is unresponsive and not breathing normally. There is no immediate access to a defibrillator. According to UK adult basic life support guidelines, what is the next step?ADeliver 5 initial rescue breaths then 15 compressions to 2 breathsBBegin chest compressions at a rate of 100 to 120 per minute with a depth of 5 to 6 cm and a 30 to 2 compression–ventilation ratioCCheck for a carotid pulse for 30 seconds before starting CPRDPlace the patient in the recovery position and observeEGive 2 rescue breaths only and wait for the ambulanceCheck my answer