Food safety has become a hot issue in modern society. A social survey of a city this year showed that 29.2% of the respondents had sense of security. 23.8% of the respondents did not have sense of security, compared with 22.4% and 32.6% last year. As a result, investigators assert that the city's public sense of security for food has improved this year and that the overall situation of food safety is better than last year.
The statement 'Many samples of catering operators have been added to this year's social survey' is the most likely to question the above findings.