Educational television is a contradiction in terms. While a classroom encourages social interaction, television encourages solitude. School is centered on the development of language, but television depends upon constantly changing visual images. And in a classroom, fun is merely a means to an end, but on television it is the end in itself. Upon which one of the following assumptions does the author rely in the passage? ['The classroom should not be a place where anyone has fun.', 'Television programs reinforce some of the values of the school environment.', 'Only experiences that closely resemble what takes place in the school environment can be educational.', 'The potential of television as a powerful learning tool has not yet been realized.']