Examination reliability refers to the objectivity of the test and the degree to which an exam reflects the true level of the candidate. According to the above definitions, which of the following items have a smaller impact on test reliability? ['Mr. Li bet two math problems in the middle school entrance examination.', '0% of the girls did not answer the question "Who is the World Footballer 2013"?', 'One week before the test, the political economy teacher assigned the test scope to his students.', 'In the same composition, Mr. Wang gave 50 points, but Mr. Li gave only 40 points.']