Question ID:PT93 S3 Q23 Passage:Superstring theory is a controversial new theory in physics that purports, unlike more established physical theories, to explain the nature and existence of gravity. A major problem with superstring theory is that to test it we would have to build a particle accelerator 100 trillion kilometers long. Another problem is that superstring theory has had no success in adequately explaining why the force of gravity is not stronger or weaker than it is. Stem:Which one of the following is most strongly supported by the information above? Correct Answer Choice:EChoice A:Superstring theory would be more successful if superstring theorists attempted to explain why the force of gravity is not stronger or weaker than it is. Choice B:Physical theories that are better established than superstring theory provide better explanations of physical phenomena than does superstring theory. Choice C:Some physical theory more established than superstring theory has had at least some success in explaining why the force of gravity is not stronger or weaker than it is. Choice D:A physical theory cannot be true if testing that theory would require us to build a particle accelerator 100 trillion kilometers long. Choice E:A theory that purports to explain the nature of a force is deficient if it cannot account for the strength of that force.