The correct option is C.
When analyzing an audience for a descriptive essay, one should consider THE BACKGROUND INFORMATION THAT ARE NEEDED TO MAKE ONE'S DESCRIPTION MORE MEANINGFUL.
When asked to write a descriptive essay for an audience, it is very important that one gets relevant background information that will make the descriptions in the essay very accurate and easy for one's audience to understand. All efforts should be made to avoid any form of vagueness in description.