The question that actually relates to purpose is:
Let's understand what purpose is all about.
Purpose actually refers to what one tries to achieve at the end of a cause. It usually portrays a reason why someone is doing what he/she is doing.
The question here is asking if one is "writing to teach?". In order words, the person is asking if your purpose of writing is to teach.
Learn more about purpose of writing on https://brainly.com/question/9068423