Because people are generally better at detecting mistakes in others' work than in their own, a prudent principle is that one should always have one' s own work checked by someone else. Which one of the following provides the best illustration of the principle above? ['The best elementary school math teachers are not those for whom math was always easy. Teachers who had to struggle through math themselves are better able to explain math to students.', "One must make a special effort to clearly explain one's views to someone else; people normally find it easier to understand their own views than to understand others' views.", 'People should always have their writing proofread by someone else. Someone who does not know in advance what is meant to be said is in a better position to spot typographical errors.', 'Juries composed of legal novices, rather than panels of lawyers, should be the final arbiters in legal proceedings. People who are not legal experts are in a better position to detect good legal arguments by lawyers than are other lawyers.']