With the increase of the resident population in a city, the per capita area of sports venues is gradually decreasing. According to a recent study, the physical fitness of residents in the city has gradually declined in recent years. Based on this, some experts believe that the lack of sports venues As a result, the amount of exercise of the residents is insufficient, so the physical fitness of the residents has decreased year by year. Which of the following, if true, would most weaken the above conclusion? ['Most free sports venues in the city are deserted all year round.', 'Total annual consumption of residents in sports continues to rise.', 'The types of regular sports that residents in the city are increasing.', 'The number of residents who can continue to exercise has declined year by year.']