A is the correct answer because a prepositional phrase is telling where something is located. so a is saying that the envelope is in the drawer.
Everyone has a story to tell, whether from their<span> own life or from the depths of </span>their<span> imagination. Such a ... A </span>narrative<span> includes characters, plot, conflict,</span> setting<span>, the point of view, and atmosphere, which </span>will<span> work together to share the </span>writer's<span> intended message. ... For fiction, you need to create </span>engaging <span>characters of your own. </span>
I believe it would be to inform, the particular excerpt isn't really informing about anything, and its not persuading the reader to do anything, simply attempting to entertain the reader with a story.
A. The Professor
Hope you get it right.