Some factors that may make it difficult to keep speed during a stairway evacuation are exhaustion or the person's mental state. During a period of evacuation, the stress suffered is going to affect how people are going to respond, and how they are going to react. Also, the architecture of the stairway may affect the stairway evacuation process.
Answer:
a.) Operating big businesses.
Explanation:
Protestors of the Vietnam war were shot at and 4 were killed by the Ohio National Guard
