Identify the Main Point or Issue in the Following Passage,and

Identify the main point or issue in the following passage,and decide whether the rest of the passage offers reasons for the main point (such as,whether the passage contains an argument),whether it illustrates (provides examples for)the main point,whether it explains the point,is irrelevant to the point,and so on.
"Luckily,most decisions can be reassessed.Even decisions that seem monumental can often be altered.Suppose you decided to live off campus because it offered more privacy and independence as well as a change from campus residential living.However,you discovered that your expenses were greater,you didn't like to cook for yourself,and you got lonely.Or suppose you chose to major in nursing because you thought you would always be able to find a job in that career.But halfway through your coursework,you found you didn't like science,practicum labs interfered with your family time,and the sight of blood made you ill."
-D.G.Longman et al. ,Strategic Thinking and Reading
First sentence states main point;the remainder provides examples of (and thus evidence for)the main point.