After Twenty Years by O. Henry

Why is the policeman walking along the street and checking the doors of the buildings that he passes?

A. He is trying to find out if a criminal is hiding in one of the buildings.

B. He is trying to prove to anyone watching that he is doing his job.

C. He is hungry and wants to find an all-night lunch counter that is open.

D. He is making sure that the doors are locked and the businesses are safe.

Answer: B. He is trying to prove to anyone watching that he is doing his job.

Explanation:

In the passage from the story "After Twenty Years" by O. Henry, the policeman is depicted as walking along the street and checking the doors of the buildings he passes to show that he is actively patrolling and ensuring the safety of the neighborhood. The impressiveness of his movements, twirling his club and casting watchful eyes down the street, is not for mere show but to demonstrate his dedication to his role as a guardian of the peace.

The officer's actions suggest that he is making sure that the doors are locked and the businesses are safe, rather than trying to find a criminal or seeking a place to eat. By diligently carrying out his duty and maintaining a visible presence in the vicinity, the policeman conveys a sense of security and reassurance to the community.

Therefore, the most fitting answer to the question is B. He is trying to prove to anyone watching that he is doing his job, showcasing his commitment to upholding law and order in the neighborhood.