Formal.
As far as I know, there is no such thing as either standard or practiced diction. Informal is the way you communicate with your friends, for instance, which is not how you would write a thesis paper, legal document, etc.
Well, really, when I write like that, I just give examples and I refer back to the previous topic, showing that I am still talking about it.
I dont understand the question can you explain it more
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.
