The words are too informal, the letter is lacking information, and there isnt a headline
Answer :
Cambridge English Dictionary defines hyphen as " the symbol -, used to join two words together, or to show that a word has been divided into two parts at the end of one line and the beginning of the next".
The correct answer, with all the hyphens in the right places, is :
The professor seemed very self-assured, but the students were afraid he would resign, which is why they re-signed the petition to investigate the false allegations made against him.
According to Levitt and Dubner, authors of the notable bestseller "Freakonomics", students have always had the reason to cheat - to get higher grades, which eventually prove to be a way to a better social standing. However, teachers also began to cheat, because now they also have an incentive to do it, because their jobs often depend on their students' success. A whole school in Chicago was on the verge of shutting down because of low grades, and teachers were caught cheating, so as to preserve their jobs. They cheated because they had an incentive. However, according to Levitt and Dubner's research, it's still the minority of teachers that will cheat (about 5%), whereas the majority of them is honest. The same goes for sumo wrestlers, who will often cheat because they aren't satisfied with the low wages most of them get.
Answer:
The correct answer would be Paula is moving to Chicago, where winters are cold.
Explanation: