This phrase is in reference to how Atticus dealt with Mayella on the stand during Tom Robinson's trial. Mayella testified that Tom Robinson raped her and beat her up. During his questioning, Atticus found holes in Mayella's story. He got her confused and made her sound as though she wasn't sure about the details or that she wasn't as strong of a person as she'd like to be. This made it difficult for Mayella to twist the truth to make Tom Robinson seem guilty so she stopped talking. She gave some testimony and then quit answering questions all together. Unfortunately, even though Atticus's questioning of Mayella revealed some significant inconsistencies and improbabilities the jury still convicted Tom Robinson because of his race.
Lieutenant is not a part of the main clause, and it is an address to a person that is inserted into the sentence. It must be therefore separated by comas on both sides: the correct answer is a.
I chose to become a Christian to try and give myself a fresh view and new perspective on life. With all of my past wrong doings, I needed a change in my life. Something to make me believe in new beginnings and forgiveness. As a Christian, I have started to attend Church every week, as much as I can, I have started to recite and learn the 'Secret Of Prayer', and I am now constantly relying on the Holy Spirit.
-Hope this helps! xo