D. "his sister, who had taken a sales job, learned shorthand and French in the evenings so that she might be able to get a better position later on"
She is supporting an inference from the text. An inference is something that is implied, and the person saying they've "witnessed much fighting" infers that they're old, whereas "I am wounded with iron" can be taken to mean he's been wounded by a weapon like a sword.
a. is the most reasonable. if i'm wrong srry.
Internal conflict, I think. I am sorry if it's wrong!
