Luiz is taking three classes this semester. In the first class he has only one exam all term and he feels quite a bit of pressure. In his second class the teacher will give six quizzes and only count the highest three toward his final grade. He thinks this is going to be very easy. In the third class, he has four equally weighted exams. He thinks this class will be challenging but doable if he keeps up with his studies. According to the Yerkes-Dodson law, though, in which class is Luiz most likely to get the best grade?