Parents of students in a certain school: Now the students are under too much pressure to do their homework until 10 o'clock in the evening, there is no childhood happiness! Teachers of the school: The school itself did not give the children too much pressure and assigned little homework. Parents reported too many tutoring classes to the children, which led to the late completion of various homework. Children did not have time to play, so there was no Happy childhood. Which of the following, if true, would most likely challenge the school's explanation? ['The school does not have much student work compared to other schools.', 'The school teacher feels that the assignment is less, but the students still feel a lot.', 'Although the teacher did not assign much written assignments, the requirements of the assignments required students to apply for class tuition.', 'Stressful students are a common social problem, and not solved by teachers in the school.']