How does the application of force to the person's waist during the Heimlich maneuver create enough pressure to expel an obstruction from the trachea?

• A. It causes the air in the esophagus to compress and push the obstruction out.
• B. It stimulates the gag reflex, causing the person to cough and dislodge the obstruction.
• C. It increases pressure in the abdominal cavity, forcing air out of the lungs and dislodging the obstruction.
• D. It creates a vacuum in the trachea, pulling the obstruction out.