Many elementary schools have recently offered computer-assisted educational programs. Students' reactions after several years have been decidedly mixed. Whereas students have found computers very useful in studying arithmetic, they have found them of little help in studying science, and of no help at all with their reading and writing skills. Which one of the following, if true, most helps to explain the students' mixed reactions? ['Of the disciplines and skills mentioned, the exactness of arithmetic makes it most suitable to computer-assisted education.', 'Young students are more likely to maintain interest in training programs that use the newest computers and video graphics than in those that do not.', 'Students in these schools began reading and doing arithmetic before learning to use computers.', 'Many elementary school teachers are reluctant to use computer technology in their classrooms.']