Which of the following is NOT a suitable material for separating an audience from a passageway?

Cardboard is not suitable for separating an audience from a passageway because it lacks the necessary durability and structural integrity required for safety and effectiveness in a public assembly setting. Unlike materials such as rope, tape, or fencing, which can provide clear visual boundaries and withstand interactions with people, cardboard is easily damaged, can be knocked over or pushed aside, and does not provide a reliable barrier. This weakness could lead to confusion or accidental encroachment into the passageway, which is particularly concerning in emergency situations where clear access is crucial. The alternatives—rope, tape, and fencing—are all more reliable options for crowd management due to their stability and visibility, essential traits for maintaining safety in assembly spaces.