For years, university administrators, corporations, and government agencies have been predicting an imminent and catastrophic shortage of scientists and engineers. But since there is little noticeable upward pressure on the salaries of scientists and engineers, and unemployment is as high in these fields as any other, these doomsayers are turning out to be wrong. Which one of the following would, if true, most strengthen the argument above? ['The proportion of all research in science and engineering being carried out by corporations is larger than it was five years ago.', 'The knowledge and skills acquired during university programs in science and engineering need to be kept current through periodic retraining and professional experience.', 'Most students choose fields of study that offer some prospect of financial success.', 'The number of students in university programs in science and engineering has increased significantly in the last five years.']