You can infer that Bill Gates was very intelligent, but he _________ .

Answer "Needed to be left alone to do what he liked" is the exact opposite of what the passage proves: Gates needed more structure, not less.
Answer "Was prohibitively shy" is an incorrect detail. Answer "Clearly enjoyed recess more than class" is not proven in the passage, but correct answer is an inference that makes logical sense. We are never told that Gates needed a different environment, but it is strongly implied.