The phrase from the excerpt that best indicates that the purpose of the essay is to inform is “I know this for a fact”. This phrase helps the author introduce evidence to the text that supports her ideas.
In this case the author tells a personal experience as a way to provide more information and the context of her essay.
The rest of the options are incorrect as they are part of the personal experience that the author is narrating.
Answer:
Atypical behaviors should be noted and carefully recorded. They may be isolated events that have little or no impact on later development. ... Patterns of atypical behavior can be useful in confirming areas of need.
Explanation: