We can't get through life without learning because, we want to be able to help others and provide others with knowledge and insight. (But yeah.. are there even answer choices to this?)
The answer is C as it is said at the start of the introductory paragraph I hope this helps
It is B Their because it's not your seat, nor is it his seat their is more than one. Nor is it our.
So It is B Their
If you look at the reasons Tom Robinson suspected Maybella's father of beating her, that should help. Have a look at Tom's story of what happened and all the evidence from his side, including Maybella having bruises on the right side of her face, and her father being left handed, and no medical help was called for even though she was covered in bruises.
I hope this helps a little :)