At present, college students generally lack the literacy of Chinese classical literature. According to the survey, only about 5% of the surveyed students like Yuan Qu. Which of the following statements weakens this view most? ['The investigation may be inaccurate.', 'The scope of the investigation may be too small.', 'The study of Chinese classical literature is a long process.', 'The lack of Chinese classical literature literacy cannot be judged solely by whether they like Yuanqu.']