So pretty much how does the author feel about the topic

Authors usually have their opinions, ideas, concepts, memories of their past struggles, perspectives and views which they wish to express. Very often they use their stories to express the combination of emotions. If they are able to make others feel their emotion through their work, they feel proud they have written well.

It it B. Those are the only ones that use apostrophes correctly (They don't need them), and they agree in number as well. D would be correct if theirs was changed to their. So B is the correct answer