If John is not attending medical school, then he is attending business school. John is not attending business school, so he must be attending medical school. Which one of the following most closely parallels the argument's reasoning? ['All scientists hold a graduate degree, and Dan is a scientist, so he must hold a graduate degree.', 'If Eric is eating soup, then he is not eating a sandwich. Eric is eating a sandwich, so he is not eating soup.', 'Hank is the best college basketball player, and ttherefore, he will play professionally next year.', 'If Maria attends the ballet, then she will wear a dress. Maria is wearing a dress, so she is at the ballet.']