Students should be educated. What is wrong with this thesis statement? Not all students should be educated. It is not a research question. It is not long enough for a thesis. It is neither debatable nor specific.

The correct answer is - It is neither debatable nor specific.

The statement that students should be educated is definitely not debatable - who would argue against that? Everyone believes that education is important for students, so there is no need to debate about that. Similarly, the thesis statement is not specific enough - it would be better to add the age, or sex, or something more relevant.