I believe the answer is D. You and your partner are the only two who can determine how close you are.
A. It lacks parallel structure
Hey! I hope you are doing okay, and here is my answer with my own words, all I hope is you turn my words into your own :)
Illustration is a very important text feature because it provides an imagery to the reader. Illustration is what makes a story more interesting. It provides a base for the imagination the reader can create in their mind.
Honestly I hope this is what the question meant. Good luck!
In an essay it should only be one I'm pretty sure, but in a narrative as many as it takes to explain a lesson learned. If you were writing a book your conclusion would be whatever comes to you and whatever you feel the characters would do/say/feel.
I am sorry to answer. But can you be more specific.