According to a recent survey, in recent years, among the high-income (referring to legal income of 120,000 or more) annual income of foreign enterprises in cities, foreign returnees (referred to as "returnees") account for 60%, which fully explains Those who graduated from college (referred to as "natives") are extremely difficult to obtain high salaries in foreign enterprises in the city. Which of the following, if true, would best strengthen the above conclusion? ['Among the foreign-funded enterprises in the city, the number of "local" is 40%.', 'Over 50% of the "foreign" in the city\'s foreign companies.', 'Among the employed people in the city, the "returnees" are only 10% of the "natives".', "n the city's employment population, the ratio of returnees to natives is about 6: 4."]