It is clear from the passage that, among writers of nonfiction, there is a great variety of aim ----.

Nonfiction, unlike fiction, is based on real people and
real events and presents factual information. A writer
of nonfiction often sets out with a certain purpose in
mind and directs the writing to a certain intended
audience. For example, the writer may set out to
explain, to persuade, or to entertain. The writer may
direct the essay towards people already familiar with
the subject or people who have little or no knowledge
of it. You will gain more from reading nonfiction if you
examine the techniques the writer uses to
accomplish the purpose, the support the writer uses
to back up the main idea, and the way the writer
arranges the supporting information.