Final answer:
The best technique to prevent air from entering the victim's stomach during bag-mask ventilation is to administer a breath just until the chest rises, ensuring the air goes into the lungs.
Step-by-step explanation:
To minimize the risk of air entering the victim's stomach during bag-mask ventilation, the recommended approach is to give a breath just until you see the chest rise. This technique ensures that the air is going into the lungs rather than the stomach, which can occur if breaths are too large or given too quickly. This situation aligns with respiratory management principles where appropriate ventilation avoids complications such as gastric inflation which can lead to increased risk of regurgitation and aspiration.