Answer:
I think it's simple past B.
Explanation:
Because it's not V-ing or has/have V-ed or have/has been V-ing
It is interrogative because a question is being asked. It is usually interrogative if there is a question mark at the end.
B. Atticus will not use a gun unless it is absolutely necessary. It is part of his code of honor. He believes you should try to reason first.