Which of the following levers is primarily responsible for deploying the escape slide on the ERJ 175?

The answer is the escape slide lever because it is specifically designed to initiate the deployment of the escape slide system in emergency situations. When activated, this lever releases the slide from its stowed position, allowing it to inflate and become ready for passenger evacuation. This mechanism is crucial for ensuring a rapid and safe exit from the aircraft in case of an emergency during which quick evacuation is necessary.

The other options pertain to different systems or functions within the aircraft. The lock/vent flap lever is associated with controlling the airflow and cabin pressure but does not relate to the escape slides. The cabin pressure lever is responsible for managing internal cabin pressure, which is essential for passenger safety during flight but not directly involved in emergency exits. Lastly, the emergency exit lever typically refers to mechanisms that open aircraft doors, but does not directly engage the escape slides. Thus, the escape slide lever is clearly the appropriate answer as it directly handles the deployment of the slides used for evacuation.