Question. The person was prevented from leaving work, what blocked him in the street?
Options:
- building
- demonstration
- laugh
- garage
- conference
Answer. demonstration
What step-by-step reasoning justifies that answer?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Reasoning: Demonstrations are usually held in a public place. Streets are a public place.