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
I think the answer is characterization (I originally said plot but I just realized that I made a mistake when I was reading. Sorry about that! Hope I didn't mess anything up for you.) :D
C) summarizing explains all of the main ideas in a source while paraphrasing focuses on just a few sentences
