The correct answer is A.
The author does not allude the visitor as being Herbert. He merely call it "the thing outside". Therefore, this is not a way the author creates suspense in the story.
The rest of the options: the description of the scraping, the echoes of the knocks, and the difficulty to find the object that was needed, are all elements that help build up suspense in this passage.
Chorus were the horses people used to ride
Key Words? Do you have multiple choice or a word bank?
"The rate of change of momentum of an object is directly proportional to the resultant force applied and is in the direction of the resultant force."
Show them good grades you got before you ask them and then do chores be in a good mood