Final answer:
Option 2). If you find a child unconscious and not breathing, give rescue breathing for about 1 minute before calling the local emergency number.
Step-by-step explanation:
Give rescue breathing to a child who is unconscious and not breathing for approximately 1 minute before dialing the local emergency number. This is due to the fact that oxygen cannot be denied to the brain for very long, and rescue breathing can assist in restoring oxygen to the child's body. After beginning rescue breathing, dialing the local emergency number right away guarantees that trained medical assistance is on its way. Hence, Option 2) is the correct answer.