Answer:
"Higher education is very expensive because it is maintained at very high costs, including the salary of highly qualified professionals."
Step-by-step explanation:
Since you don't offer any answer options, I created a very narrow thesis statement.
A Thesis statement is considered narrow when it presents a very specific and very well explained idea statement, giving no space to be developed in the text. An example of this can be seen in the thesis statement created above, where in a single sentence it explains the reason why higher education is expensive, presenting the reason in a very specific way and giving space for development.