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
D) I am so terribly sorry., would be the most formal.
D. keep you from reaching your performance goals
If electricity stopped working it would scare the population and they wouldn’t know what to do but over time for example a year after, the population most likely would’ve adapted to this obstacle or learned how to overcome it bringing new ideas and new solutions to problems that needed electricity
