Answer:
Then, Klaus grew into manhood, and he began to view the wall through another lens. It became an oppressor that the people in the East dared not question or appear to challenge in any way.
Explanation:
This passage uses metaphor.
Specifically, Orwell is using a metaphor to describe the effect of the British Empire. Wood is passing -- the speaker sees it but does not realize at first that the wood is being carried by old women. When he finally does see them, he realizes how old and crushed they are beneath the weight of the wood.
The Empire is much the same. It passes -- it moves along -- but as it does so, it crushes beneath it the oppressed, whose lives make it possible for the Empire to run smoothly.
The event in the story that is a key detail in Holmes’s solution of the case is "<span>a. the observation that Mr. Wilson belonged to the Freemasons" since this was the society that had raised suspicions before. </span>