I would say "B." is the most appropriate for this passage.
Answer:
A
Explanation:
It is the most reliable source, the others either don't match or make sense. Please tell me if I am right.
Greetings once again, Gary :)
- Why is Tom Robinson unable to use his left arm? -
B) It got caught in a cotton gin.
(B) is correct because Reverend Sykes tells the children (Scout, Jem, and Dill) that Tom got his hand caught in a cotton gin when he was a child.
~Hope I helped!~