Answer:
A) The reader does not get to hear the full story
Explanation:
I say this because think about it. In first person you are essentially in the mind of the main character, meaning you learn/know what they learn/know. Because of this, if the main character does not know the full story, and everyone else's point of view (which they don't), then neither do you. I don't know if I explained this well, but I hope you get it.