The correct answer is C) instruct the reader about a topic.
The purpose of an informative essay is to instruct the reader about a topic.
When an author writes an informative essay, it has to use appropriate and educated language so is clear for the audience to read and understand and have the capacity and knowledge to describe complex topics clearly and straightforwardly.
That is when the author has to consider the following questions.
Is my writing interesting? Am I specifying rather than generalizing? Are my spelling, grammar, and punctuation correct?
The revising process of an informative essay is of the utmost importance in that here is when we are going to double-check that information is correct, that we used proper primary and secondary sources, and edit the information that is not useful.