When assisting a child with ventilation: a. do not over-inflate his lungs b. pinch his nose closed c. allow the child to exhale on his own d. all of the above?

Hello There!

Based on my First Aid classes the answer is D. All of the above.
If someone turns unconscious, you'd have to perform CPR and call an emergency service as soon as possible.

Hope This Helps You!
Good Luck :) 

- Hannah ❤