Answer:
The speaker is most likely the author.
Explanation:
Hope this helps!
The phrase <em>with exciting plots </em>is used as D. adjective phrase, because it modifies the noun <em>books.
</em>What kind of books? - (The ones) with exciting plots. <em>
</em>
so all you have to do for the first one is write about someone that happened to you in the past or if you are speaking 3rd person/2nd/person/1st person write about it like that. and for the second one just write tiny affirmations or whatever