The school posts fire-drill routes only near main entrances, yet students usually notice evacuation signs closest to the rooms where drills begin. In a hallway where routes were posted beside classroom doors, students reached the correct stairwell with fewer teacher prompts. Thus, drill-route information is more useful when displayed at the actual starting locations. Therefore, the school should post evacuation routes beside classroom doors throughout the building. Which statement is both a conclusion from the sign-placement evidence and a premise for the final recommendation?