The laboratory experiment, the most effective method for teaching science, is disappearing from most secondary school curricula, and students are now simulating experiments with computers. This trend should be stopped. It results in many students' completing secondary school and going on to a university without knowing how to work with laboratory equipment. Which one of the following, if true, most weakens the argument? ['Computers have proven to be a valuable tool for teaching secondary school students scientific terminology.', 'In some secondary schools, teachers conduct laboratory experiments while students observe.', 'Secondary schools and universities across the nation have put a great deal of money into purchasing computers.', 'University students can learn science effectively without having had experience in working with laboratory equipment.']