Philosopher: The eighteenth-century thesis that motion is absolute asserts that the change in an object' s position over time could be measured without reference to the position of any other object. A well-respected physicist, however, claims that this thesis is incoherent. Since a thesis that is incoherent cannot be accepted as a description of reality, motion cannot be absolute. The argument uses which one of the following argumentative techniques? ['attempting to persuade by the mere use of technical terminology', 'inferring from what has been observed to be the case under experimental conditions to what is in principle true', 'generalizing from what is true in one region of space to what must be true in all regions of space', 'relying on the authority of an expert to support a premise']