I’m sorry, I don’t quite understand your question. Would you like to further elaborate so I can help? Let me know :)
The correct option is: <em>the reader could set his or her own pace and reread parts for clarity.</em>
When we read a text, we are able to do it in <em>our own pace</em>, <em>managing our time</em>, and <em>reading again</em> the parts we could not understand the first time.
On the other hand, <em>listening to audios</em> (or watching videos) can easily <em>affect our emotional perception</em> about a particular theme.
Irony is definitely the answer to your question.
The answer is B because it doesn't have any commas and it wouldn't make sense without it. Looks like you got it correct.