Answer:
D. have read the work being discussed but still need pertinent details explained.
Step-by-step explanation:
When writing the literary analysis, you should consider who the audience is. As you are not writing the general review but the study of the piece, the chances are it will be read by the knowledgeable audience that has read the work that is discussed - your professor, other students, researchers, etc.
Therefore you should avoid summaries that retell the whole piece, as the audience has already read it.
However, because of the understanding of the analysis, some most important details should be explained to have a full, detailed evaluation and interpretation.
This is more in order to analyze everything than to retell the plot or details to the audience. While readers do know the piece, you are there to introduce them to the fuller background of the piece and explain the details.