You receive a call to a local daycare center for a 3-year old boy who is not breathing. When you arrive and assess the child, you find him to be in cardiopulmonary arrest. You initiate CPR and request a back-up ambulance. As you are performing one-rescuer CPR, your partner prepares the AED. The appropriate compression to ventilation ratio for this child is
A. 3:1
B. 5:1
C. 15:2
D. 30:2
