Your patient is a three-year-old female who is unresponsive from ingesting several tablets of a tricyclic antidepressant. You are transporting her to the nearest hospital, which is 30 minutes away. Due to the child's lack of a gag reflex, you are preparing to intubate. If time allows before attempting laryngoscopy, you should have an assistant ventilate the child with 100 percent oxygen for:

A) 30 seconds.
B) 2 minutes.
C) 5 minutes.
D) 1 minute.

B