A recent survey by the tax bureau of a city showed that locals accounted for more than 80% of the self-employed households that paid the most taxes last year, which fully shows that foreigners are generally not as good at doing business like locals. Which of the following, if true, would best support the above conclusion? ['Among the self-employed households in this city, foreigners account for 35%.', '0% of local self-employed households.', "Outsiders accounted for 25% of the city's low-income population.", "The proportion of foreigners in the city's total population is 30% higher."]