Directions: The questions in this section are based on the reasoning contained in brief statements or passages. For some questions, more than one of the choices could conceivably answer the question. However, you are to choose the best answer; that is, the response that most accurately and completely answers the question. You should not make assumptions that are by common sense standards implausible, superfluous, or incompatible with the passage.
If a person studies four hours a day for the GMAT, he will score in the top 10 percent. Every student at Harvard Business School scored in the top 10 percent. Thus, Sarah who is studying at Harvard Business School must have studied at least four hours a day.
The reasoning in the argument above is flawed because it