Why is elementary school success an indicator of graduation rates?

why is this sentence not a thesis statement?
it is not a debatable topic.
it is a question.
it is an opinion.
it is not a fact.

answer; i believe that the correct answer is rapid and subsequently slow down;

the most likely outcome of fewer loon territories is that hawks would increase in proportion because the benefit of victory would be greater. hawks and loons are natural rivals of resources and victories in the game, since the lakes drying up affected the loons, the hawks would be benefited from the drought.