Science fiction creates an appetite for interstellar space exploration among certain people. Unfortunately, this appetite cannot be satisfied with any technology humanity will soon possess. Since gaps between expectations and reality spur discontent, no doubt one effect of science fiction has been to create an unproductive dissatisfaction with the way the world actually is. Which one of the following is an assumption the argument requires? ["The fact that the appetite for interstellar space exploration cannot be satisfied with any technology humanity will soon possess has created a gap between reality and some people's expectations.", 'If science fiction has created an unproductive dissatisfaction with the way the world actually is, it has done so only by creating an appetite for interstellar space exploration among certain people.', 'If the appetites science fiction has created in people could all be satisfied with technologies that humanity will soon possess, then science fiction could not create an unproductive dissatisfaction with the way the world is.', 'Most people unrealistically expect that technology that humanity will soon possess could satisfy the appetite for interstellar space exploration.']